1. Solar energy is............by the sun ( provision)
2. What can we do ...........energy? ( conservation)
3. Tom, remember to use energy more.........! (effcient)
4. We can protect the environment by ..........air ........(redution/pollute)
5. Huong speaks English more........than Lan .(fluent)
6. She speaks English quite...........(good)
7. The old man walked .........to the park. (slow)
8. The street is............with people watching colorful parades.( crowd)
9. Tuan sighed .........when he heard that he failed the test (sad)
10. A tidal wave brings death and..............in its quake. ( destroy)