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 đc thì ghi loại luôn giúp em ạ ^^