Question

Answer 1

Bài 1:
2, has / seen
3, go
4, visited
5, bought
6, have / been
Bài 2:
2, 
3, listen
4, 
5, 
6, text (ko chắc lắm)

Answer 2

2.has_seen

3.have gone

4.has visited

5.have bought

6.have_been

Answer 3

2, Has / seen
3, go
4, visited
5, bought
6, Have / been