1. If you _________ (expose) phosphorus to air, It _________ (burn)

2. If you _________ (heat) ice, it _________ (turn) to water.

3. If metal _________ (get) hot, it _________ (expand)

4. If you _________ (stand) in the rain, You _________ (get) wet

5. If anyone _________ (ring)
 the bell, don’t _________ (open) the door.

6. If my father _________ (not, sleep) well, he _________ (drink)
 coffee before going to bed

7. If you_________ (press) this button, the machine _________ (stop)


8. If you_________ (multiply) 6 to 8, you_________ (get)


9. If anyone _________ (call), say that I_________ (be, not) at home.

10. If you_________ (go) to the Post Office, you_________ (mail) this letter for me
nếu được thì ghi loại luôn giúp em với ạ ^^