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

- 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 reduced/turned down at night.

3. - They suggested that the entrance examination should be taken carefully.

- They suggested that we should take the entrance examination carefully.

4. - Taking care of her puppy is her responsibility.

- Caring about her puppy is her responsibility.

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

- I suggest 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 the fact that we don't study in the same class, we often help each other.

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

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

 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 reduced at night

3 they suggested that the entrance examination should be taken carefully 

  they suggested that we should take the entrance examination carefully 

4 taking care of her puppy is her responsibility 

  caring of her puppy is her responsibility 

5 i suggest the pipes should be checked by a plumber

  i suggest that a plumber should check the pipes 

6 since Hoa was very tired , she left the party early

7 i suggest inviting Hoa and Tuan to join our club

8 although he 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 studing in different class , we often help each other

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

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