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The answers are: 21. D. are 22. B. much 23. A. but 24. C. make 25. A. exercise Here are the answers: 26. C. a language 27. B. do the housework 28. A. Old people 29. D. Write a book 30. A. robots 31. C (should be 'in' instead of 'at', and '8th' instead of '8^th') Corrected sentence: My birthday is in the summer on 8th June. 32. A (should be 'Did you watch' instead of 'Did you watched') Corrected sentence: Did you watch the show last night? 33. C (should be 'The weather was bad so they couldn't go on a picnic' or 'The weather was bad because they were not able to go on a picnic') Corrected sentence: The weather was bad so they couldn't go on a picnic. 34. A (should be 'She is having' instead of 'She having') Corrected sentence: She is having an English test tomorrow.