1) Tom studied very hard for the exam. ______________ he got a good score.  a) Therefore b) Unless 2) You won't improved ______________ you spend time on practising.  a) therefore b) unless 3) It rained heavily this morning. ______________ we decided to reschedule our trip to Disneyland.   a) Therefore b) Unless 4) You won't be able to open the door ______________ you have keys. a) therefore b) unless 5) We won't be able to catch the bus ______________ we leave home now.  a) therefore b) unless 6) People keep destroying forests to make more land to build houses. ______________ animals have fewer places to live.  a) Therefore b) Unless c) If 7) Fishermen keep catching sharks to sell shark fins to earn money. ______________ sharks will be extinct soon.  a) Therefore b) Unless c) If 8) Endangered animals will be extinct soon ______________ we try to protect them. a) therefore b) unless c) if d) because 9) The number of sea animals will decline ______________ we start protecting the ocean. a) therefore b) unless c) if d) because

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