IX/
1a
2a
3c
4a
5c
6d
7a
8b
9delicious
10. Any left

Bài 9:
1.A
2.A
3.C
4.A
5.C
6.D
7.A
8.B
9.delicious
10.any left
Bài 10:
1.We have lived here in 2012.
2.I think learning English is interesting.
3.Her book is different from mine.
4.It's a good idea to walk around the Old Quarter at night.
5.I have played soccer for 5 years.
6.Pop music is my favorite music.
7.I find learning English important.
8.I was sick,so I didn't go to school.
9.You should eat less meat and more vegetables.
10.How much does a plate of fried rice cost?
Bài 11:
1.Did you use to go to the beach when you lived in Nha Trang?
2.Linda used to live with her parents.
3.I used to collect stamps as when I was in primary school.
4.He used to be a poor man,but he becomes a rich businessman.
5.They didn't use to go to the cinema every Sunday last year.
6.in the past my hair used to be longer than that in the past.
7.I used to stay up late to watch football matches last year,but now I don't.
8.There used to be some trees in the field,but now there aren't any.