17. the doctor made the the medicine and persuaded him to keep the bed. a to take b take c took d taking 18. i fifty driving lessons but i still cannot drive. a have had b was having c will have d had had 19.heis free now. at the moment. a is having his window painted b is having his windows painting c has had his windows painted d has his windows painted 20. he said he interested in mathematics since he went to school. a has been b is been c was d had been 21.i'm afraid i to meet my friend at the airport next sunday. a can't b am able c am not able d won't be able 22. look at all those stars. a which, more near b what, more near c what one, the nearest d which one, the nearest 23. be at the lessons, please. a more active b more actively c activer d little less active

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