Câu hỏi trắc nghiệm (5 câu):
-
- A. getting
- B. making
- C. leading
- D. contributing
-
- A. concentrations
- B. attention
- C. lots
- D. collections
-
- A. increase
- B. have increased
- C. had increased
- D. were increasing
-
- A. To build
- B. Having built
- C. Being built
- D. Having been built
-
- A. plant
- B. being planted
- C. being planting
- D. having planted
