Ex 1: Fill in the blank with Zero conditional sentence type ( Hoàn thành câu với câu điều kiện loại O) 1. If anyone calls (call), say that I (be, not) at home. 2 .If you (go) to the Post Office, you (mail) this letter for me. 3. If metal (get) hot, it (expand) 4. If you (stand) in the rain, You (get) wet 5. If you (multiply) 6 to 8, you (get) 48 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 anyone (ring) the bell, don’t (open) the door.