Chọn đáp án đúng 1......., the phone will be cut off A. Should you not pay the phone bill today B. If you didn't spend your money on the phone bill immediately C.Unless you had paid the phone bill D. Would you have get the phone bill paid by someone 2....., I would write to him every week A. If someone tells me his address B. Did he live far away from me C. Unless he phones me D. Were I to know his address 3. You must leave now ... you will be late for school A. Unless B.If C. Because D. So 4. If gravity, the pull of the earth , is zero , everything ... A. Would float B. Would be floating C. Will float D. Floated