16. The government is trying to control pollution. A b C D. 17. I saw a ... that was very dangerous. A thriller B ... C ... D. 18. If we continue to ... many endangered species will become extinct. A will become B ... C are becoming D. 19. We should take this ... . It's a lovely day! A out B C bore D. 20. I went to Berlin to ... . A since B ... C D. 21. We can ... a boat. A throw B ... C D. 22. If you're tired, you ... go to bed. A put B C should D. 23. You haven't finished ... A did you? B ... C D. 24. Mike is ... the exam.

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