Đáp án Bài tập 1: Điền các động từ tobe phù hợp vào chỗ trống.
Bài tập 1:
- Mary is of a gentle nature.
- No one is to leave without the permission.
- If we are to get there by lunch time we had better hurry.
- He asked the company where he was to land.
- I am a student in VietNam international school.