Phần B:
1. A
2. B
3. A
4. B
5. A
6. A
7. B
8. A

Phần C:
1. The lesson hasn't started yet.
2. The teacher has already written on the board.
3. Joe and Tim have just come into the classroom.
4. Tony hasn't finished getting his books ready.
5. Christine has already opened her book.
6. Dave has dropped his pen on the floor.
7. He hasn't picked it up yet.

Phần D:
1. have you been doing
2. I've been studying
3. Have you been working
4. I've just been sitting
5. I haven't been going
6. I've been working
7. I've been painting
8. We've also been planning
9. We've been looking
10. I've been thinking

Phần E:
1. heard
2. arrived
3. been writing
4. been talking
5. invited
6. been reading
7. been playing

Phần F:
1. yet
2. for
3. ever
4. already
5. since
6. just
7. never
Xong nhé, b k hiểu thì hỏi

Phần A.
1. have seen
2. have had
3. hasn't taken
4. has been
5. Have you ridden
6. has made
7. haven't decided

sách này là gì vậy ạ. Cảm ơn bạn