21. These trees are taken care______by the gardener. A. of B. for C. on D. into 22. Lien is offered a scholarship______Harvard University. A. from B. to C. at D. in 23. Which would you like_ _____a drink, tea or coffee? A. to B. on C. at D. for 24. What do you think______my school? A. about B. at C. in D. on 25.. This book______written by Tom last year. A. is B. are C. was D. were 26. The flowers ______watered by my son every morning. A. is B. are C. was D. were 27. Peter was so sad because he______to Lan’s birthday party last night. A. is invited B. isn’t invited C. was invited D. wasn’t invited 28. These vases______ by my grandma yesterday. A. is bought B. are bought C. was bought D. were bought 29 ______the house painted by his uncle last year? A. Is B. Are C. Was D. Were 30. These postcards______to me by my friends every year. A. are sent B. are sended C. was sent D. was sended