21. turning 

suggest  +Ving: đề nghị 

22. would travel

If 2: If + QKĐ, S + would /  could + V1 

23. has just returned 

DHNB: just (HTHT)

S + has/have + V3/ed 

24. met 

DHNB: last night (QKD)

S  +V2/ed 

25. Because Nam studied very hard, he got good marks in English.

Because + clause, clause: bởi vì 

26. Although they were very hungry, they didn't eat anything at the party last night.

Although + clause, clause: mặc dù 

27. Hoa was sick. Therefore, she couldn't go camping with her friends yesterday.

Clause + therefore + clause: vì vậy 

28. My brother is very tired. However, he has to finish his homework before going to bed.

Clause + however + clause: tuy nhiên 

29. The book which I bought at a bookstore in Ho Chi Minh City last week is very interesting.

N (vật) + which + V/  S +V  

30. If I had a computer, I would finish the online assignment.

If 2: If + QKĐ, S + would /  could + V1 

31. The woman who is wearing a white dress is my English teacher.

N (người) + who + V 

`color{orange}{~MiaMB~}`