1. answer the questions (have + O + V_nguyên thể)

2. to send some letters (in order to + V_nguyên thể: để ....)

3. weak to lift the box (to be + too + adj + to + V_nguyên thể: quá .... để ....)

4. to use his car (allow sb + to V: cho phép ai làm gì)

5. jump

6. not to tell anyone her new address

7. not visit the museum

8. to send his parents her regard

1. answer the questions

2. to send some letters

3. weak to lift the box

4. to use his car

5. jump

6. not to tell anyone her new address

7. not visit the museum

8. to send his parents her regard

9. (Bị thiếu từ gợi ý rồi bạn ơi)

Suggested answer: The lesson was so long that we couldn't learn by heart.

Or: It was such a long lesson that we couldn't learn by heart.

Or: The lesson wasn't short enough for us to learn by heart.