1. Mai suggested that a better lock on the door should be put.

 Mai suggested that Huy should put a better lock on the door.

2. You should turn down the volume at night.

The volume should be turned down.

3. The suggested that the entrance examination should be taken carefully.

Thery suggested that we should take the entrance examination carefully.

4. Taking care of her puppy is her responsibility.

Caring for her puppy is her responsibility.

5. I suggest that the pipes in the house should be checked by a plumber.

I suggested that a plumber should check the pipes in the house

6. Since Hoa was very tired, she left the party early.

7. I suggest inviting Hoa and Tuan to join our club.

8. Although Tuan had a headache, he still stayed up late reading books.

9. In spite of not studying in the same class, we often help each other.

In spite of not being classmates, we often ...

10. Although she tried her best, she couldn't finish her work on time.

Mình trình bày trong hình nhé ^^