1) If we don't recycle, we (destroy)_______ our planet. a) If we don't recycle, we will destroy our planet b) If we don't recycle, we destroy our planet c) If we don't recycle, we will destroying our planet d) If we don't recycle, we going to destroy our planet 2) What would you do if you (be)_______ a robot? a) What would you do if you being a robot? b) What would you do if you be a robot? c) What would you do if you were a robot? d) What would you do if you are a robot? 3) If it (be)_____ rainy, we (stay)________ at home. a) If it rainy, we will stay at home b) If it is rainy, we will stay at home c) If it is rainy, we stay at home d) If it rainy, we stay at home 4) If I ________ (have) more money I would buy a new house. a) If I had more money I would buy a new house. b) If I have more money I would buy a new house. c) If I having more money I would buy a new house. d) If I more money I would buy a new house. 5) John _______ (come) if Mary ________ (call) him. a) John will come if Mary calls him. b) John had come if Mary calls him. c) John will come if Mary call him. d) John will comes if Mary calls him. 6) ________ you drop a piece of gold in water, it sinks. a) When b) Were c) That d) Where 7) _________ you will learn English. a) when study, b) If study, c) If you study, d) If you studying, 8) ________ the water, it boils.  a) If you heat b) What you heat c) You heat d) If you heats 9) _________red and blue, you get purple.  a) If you mixed b) You mix c) You mixing d) If you mix 10) An ice cube melts ___________.   a) if you puts in the sun. b) if you put in the sun. c) if you put in the moon. d) when put in the sun. 11) Plants die if they ________. a) don't get enough water. b) does get enough water. c) don't gets enough water. d) get enough water. 12) If you mix black and white__________ a) , gets gray. b) you get gray. c) , you get purple. d) , you get gray. 13) Coal turns into ashes ______. a) , if it burns. b) if it burns. c) it burns. d) , it burns. 14) If you heat oil in a pan________.  a) , it fries. b) it fries. c) it is fries. d) , it is fries. 15) _________ and blue, you obtain green. a) ,If you mix yellow b) If you mix purple c) If you mix yellow d) You mixed purple 16) _______meat out of the refrigerator for many days, it gets rotten. a) If you leaves b) If you leave c) If you leave, d) You leave 17) When iron reacts in the presence of air_______.  a) rust appears. b) if rust appears. c) ,if rust appears. d) , rust appears. 18) __________ a coin into water, it sinks.  a) If you throw b) If throw you c) If, you throw d) If you throws 19) _________ sugar with sulfuric acid, steam is produced. a) If you mix, b) If you mix c) What you mix d) If you mixed 20) When you add sugar to a liquid____________. a) , it become sweet. b) it becomes sweet. c) , it becomes sweet. d) it become sweet. 21) If I won the lottery _________ a very big house. a) I would buy b) , I buy c) , I buying d) , I would buy 22) _________ I would run away. a) If I saw a ghost, b) If I see a ghost c) I saw a ghost, d) If I seen a ghost 23) If he spoke Chinese ___________.  a) he apply for that job. b) , he would apply for that job. c) would apply for that job. d) , he apply for that job. 24) If they _______ (work) harder, they would get better results. a) working b) works c) worked d) are worked 25) If your friends _____ (be) in town, we could have a party. a) was b) being c) be d) were 26) If you _______ (stay) all day on the beach, you will get sunburned. a) stay b) stayed c) staying d) be stay 27) If I ________(find) a mistake, I will correct it. a) found b) find c) will found d) will find 28) I would be happier _________more money a) ,if I had b) I had c) if I had d) , I had 29) If I won the lottery ________. a) I would quit my job b) , I quit my job c) would quit my job d) , I would quit my job 30) I would have passed the exams __________.  a) if I had studied. b) , if I had studied. c) if I studied. d) , if I studied. 31) Will you go to the beach ________? a) if it is cloudy b) it is cloudy c) , if it is cloudy d) , it is cloudy 32) Would you quit your job _________? a) , if you won the lottery b) if you won the lottery c) , you won the lottery d) you won the lottery 33) Would you ________ it if you had more time? a) have finish b) has finished c) have finished d) have finished, 34) People die _________ enough water.  a) ,if they get b) if they gets c) , if they don’t get d) if they don’t get 35) If I run ________.  a) I get tired b) , I get tired c) I getting tired d) gets tired 36) When it rains _______ an umbrella. a) , I use b) , I used to c) I use d) , use 37) If you mix red and white _________. a) , you obtain black b) , you obtain pink c) you obtain pink d) you obtain black 38) If there is not oxygen ________. a) , we can not breathe. b) we can not breathe. c) we breathe. d) , we breathe. 39) The lake freezes _________. a) , if it is very cold. b) if it is very cold. c) it is very cold. d) , it is very cold. 40) Deforestation appears _____________ a) when too many trees are cut down. b) , when too many trees are cut down. c) , too many trees are cut down. d) too many trees are cut down.

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