21. It was reported that a policeman was badly injured in the explosion.
A. was reported B. a C. badly D. injured
-> Không hợp về nghĩa, injure ám chỉ bị thương trong các vụ tai nạn giao thông
22. The Principal demanded that the heaters repair immediately. Winter is coming!
A. The B. demanded C. repair D. is coming
-> Có cụm: S1 demanded (that) S2 V (nguyên mẫu) : yêu cầu ai đó làm gì
Mà the heaters là vật -> bị động -> sửa thành be repaired
23. The accident seemed to have destroyed completely his confidence.
A. The B. seemed C. to have D. destroyed completely
-> completely là trạng từ đứng sau have, trước các động từ -> completely destroyed