用所给动词的适用所给动词的适当形式填空。

1. Listen! The radio says something bad         (happen) last night.

2. He spent as much time as he could         (study) different subjects.

3. The teacher told us that light           (travel ) much faster than sound.

4. I won't be able to take part in the party if I           (not be) free.

5. There         (not be) a lot of changes in the next 24 hours, are there?

6. They are good friends. They often sit on the playground,         (talk) about their future plans.

7. Luckily, he         (catch) the first bus and wasn't late for school.    

8. The elderly like to keep pets          (make) their life better.        

9. Dad said to Mike, "I hope you          (not forget) to write to me soon."

10.The plane          (arrive). You can see your mother at once.

盐析结晶