### 25 chuyên đề ngữ pháp tiếng Anh: CD14: Bài tập cấu tạo của từ

Chọn đáp án đúng

1. Many astronomers never get back to the Earth because of _____ accidents.

2. Vietnam is known as one of the _____ nations.

3. The drug under examination has shown some _____ results when given to volunteers in some countries.

4. There might be a _____ to cheat if students sit too close together in the exam rooms.

5. He has been very interested in doing research on _____ since he was at high school.