Dưới đây là các dạng đúng của từ trong ngoặc để hoàn thiện các câu:

6. **arrive** / **had already left**
By the time we **arrived** at the station, the train **had already left** for 15 minutes.

7. **came** / **was** / **realized** / **broke**
When Jim **came** home, he **was** angry to **realize** that someone **had broken** into his house.

8. **Was** / **understand**
**Was** it hard for you to **understand** the lesson yesterday?

9. **walked** / **was** / **prepared**
As soon as the teacher **walked** into the classroom, she **was** surprised that her students **had prepared** a birthday present for her.

10. **Were**
**Were** you confident that you would win the competition?