`1.` Mai spent her summer vacation in Nha Trang.

`-` Dẫn chứng: Last year, Mai spent her summer vacation in Nha Trang.

`2.` No, she didn't

`-` Dẫn chứng: She stayed at a friend's house 

`3.` She bought a lot of gifts for her family.

`-` Dẫn chứng: She also bought a lot of gifts for her friends and family.

`4.` She saw many types of sea fish at Tri Nguyen Aquarium.

`-` Dẫn chứng: Mai saw many types of sea fish there.

`5.` It was a wonderful trip.

`-` Dẫn chứng: It was a wonderful holiday `->` She felt happy. 

1.Mai spent her summer vacation in Nha Trang

`→`Thông tin kiếm ở: Last year, Mai spent her summer vacation in Nha Trang.

2.Yes, she did

`→`Thông tin kiếm ở: ..She stayed at a friend's house ...

3.She bought a lot of gifts for her family and friends

`→`Thông tin kiếm ở: ... She also bought a lot of gift s for her friends and family .. 

4.She saw many types of fish.

`→`Thông tin kiếm ở: ... Mai saw many types of fish there .. 

5.She really liked it

`→`Thông tin kiếm ở: .. She felt happy ...