21. She is going to work every dayby bus, but today she takes a taxi.
A. is going ( goes) B. every day C. by bus D. a taxi
22. What did you do at 9 o’clock last night? I phoned you, but nobody answered.
A. did you do B. last night C. phoned D. but
23. There are some books in the shelf and some otherson the floor.
A. are B. in C. others D. on
24. Although our grandfather is old but he can help us.
A. is B. but (bỏ) C. can D. us
25. He invited me at his party but I refused.
A. invited B. at C. but D. refused