21. The dogs have been fed before they went to the party.(B)

22. The car was dirty. They haven't cleaned it for weeks.(B)

23. It took her 10 minutes to do this exercise yesterday morning.(B)

Cấu trúc: It (take) (somebody) + time + to do sth= Somebody spend(s) + time + doing sth

24. Frank is capable of doing better than he is doing now. (A)

capable + of = có khả năng

25. The scheme has been set up to help homeless people.(B)

homeless people: người vô gia cư

26. We're organizing the evening around a Japanese theme.(A)

organizing: tổ chức

27. The pollution problems have been discussed since last month.(B)

28. When they got home last night. They found that someone has broken into the house.(C)

29. How many languages are spoken in Chinese?(C)

30. The woman sitting next to me on the plane was very nervous. She hasn't flown before.(B)

Chúc bạn học tốt!!