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a)stop c)stopped b) had stopped d) will stop 11. How long you ... for me? - For half an hour. a) are waiting c) do wait b) did wait d) have been waiting 12. People ... prevent pollution of the rivers before it gets worse. a) could c) must b) need d) had to 13. If you are spoiled as a child you ... have a lot of problems in adult life. a) must c) could b) may d) should 14. The more you work the ... you'll pass your exams. a) good c) best b) better d) the best 15. In Britain you officially become ... adult on your eighteenth birthday. a) the c) - b) an d)a 16. What plant does your father work at? - He works at ... plant down the road. a) a c) - b)the d)those 17. Shall we have ... dinner today? - Don't worry, at the end of the conference they will serve a dinner. a) - c) the b) a d) an 42
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