用所给单词的适当形式填空。

l. Please keep quiet! My sister is trying _____ (study).

2. If you want to be _____ (health), you must take _____ (much) exercise.

3. They  _____ (make) a soccer game next year.

4. My best friend _____ (be) a famous writer in the future.

5. Your songs sound _____ (well).