用所给词的正确形式填空。

1. You should be much           ( health). It's good for your health.

2. Recently I listened a song _     (call) Heart Strings .

3. He told me that he          (teach)in that school for 10 years.

4. I've been        (try) to cheer him up for 20 minutes.

5. The telephone _         (invent)  before the car.