Complete the sentences:

1. Adam writes books, therefore he is a ... .

2. Helen teaches an English class. She is a ... .

3. Look at those ... ! I wish I could run like that.

4. Yesterday, Adam ... Helen.

5. The bus is leaving! Let’s run ... it!

6. The shop ... milk an hour ago.

7. You ... take a painkiller for your headache.

8. ... you should go to bed early tonight.

9. ... going for a jog?
10. You ... open the door to strangers.