Sure! Here’s the completed exercise with the correct forms of the words and verbs in parentheses:

1. There is a **collection** of books on the shelf. (collect)
2. It is very **inconvenient** for people in remote areas to get to hospitals. (convenience)
3. He is very **skillful** with his hands. (skill)
4. It is said that water collected from the local streams is **unsafe** to drink. (safe)
5. We want **friendly** relations with all countries. (friend)
6. I like to eat **healthily**, so I eat a lot of fruits and vegetables every day. (health)
7. John adores **playing** badminton in the winter. (play)
8. My father sometimes goes **hunting** in the forests. He'd like to find some more food for our family. (hunt)
9. The boy **picked** up a stone and threw it in to the river. (pick)
10. He has **collected** stamps from many countries since he **was** eight. (collect, be)
11. Which sports do you like **to play**? (play)
12. Hoa’s teacher wants her **to spend** more time on math. (spend)
13. I promise I will **try** my best next semester. (try)
14. Sandra needs to **improve** her English writing. (improve)
15. You should **underline** the word you want. (learn)
16. Can you help me **move** this table? (move)
17. Nam always (gets) **grade A** in Physics, but last semester he (got) **B**.

Feel free to ask if you need more help!