1) We __________ leave the tap running when we're brushing our teeth.  a) shouldn't b) can't c) may 2) We _________ drop litter around. a) can b) mustn't c) might not 3) People _________ waste food. a) have to b) shouldn't c) couldn't 4) We __________ recycle waste paper, plastic, bottles, and cans.  a) could b) needn't c) have to 5) We ___________ walk or ride a bike to school if possible. a) should b) must c) can't 6) We ________ have showers instead of baths. a) can't b) should c) shouldn't 7) We _________ plant more trees to stop deforestation. a) could b) mustn't c) don't have to 8) We _________ protect endangered species. a) must b) might c) needn't 9) Students _________ use their phones in the classroom. a) don't have to b) mustn't c) needn't 10) This information ________ be correct. Please check it. a) should b) could c) have to 11) She did really bad in her test! She ___________ study more next time a) has to b) shouldn't c) can 12) You __________ always tell the truth. a) must b) could c) need to

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