Exercise 4. Give the correct form of the words in brackets.
1. The most popular after-school ____________ in Viet Nam are football and badminton. (act)
2. The city library has over 60 ____________ .(employ)
3. English is an ____________ and important subject, (interest)
4. Science books are very ____________ for our study of the world. (use)
5. Ba is a famous stamp ____________ (collect)
6. They learn to play a ____________ instrument. (music)
7. The team has many talented ____________ .(play)
8. We sat on the beach ____________ a spectacular sunset. (watch)