Ý nghĩa : góp phần xây dựng xã hội văn minh tiến bộ , làm giàu đẹp cộng đồng và xã hội , mọi người rèn luyện thêm được ý thức xây dựng xã hội văn minh

1.- Liz didn't buy many souvenirs in Ho Chi Minh city .

- Did Liz buy many souvenirs in Ho Chi Minh city ?

2. - I wasn't very tired after the trip

- Were I very tired after the trip ?

3. - They aren't watching my father's new motorbike

- Are they watching my father's new motorbike ?

4. - We didn't visit Cham temples last month

- Did we visit Cham temples last month ?

5. - Trung's brother doesn't go on holiday in Ha Long Bay every summer.

- Does Trung's brother go on holiday in Ha Long Bay every summer ?

6. - They won't take their soon to the zoo next weekend .

- Will they take theỉ soon to the zoo next weekend ?

7. - My parents don't live in the countryside

- Do my parents live in the countryside ?

8. - Tom didn't give me some american stamps five days ago.

- Did Tom give me some american stamps five days ago ?

9. - Mrs.oanh isn't his our new literature teacher.

- Is mrs.oanh his our new literature teacher ?

10. - there wasn't a toy store next to the museum .

- Was there a toy store next to the museum ?