----- Nội dung dịch tự động từ ảnh ----- III Correct tenses: 1. If it costs too much, I (buy) a small one. 2. If you (drive) more carefully, you wouldn't have so many accidents. 3. What (happen) if there (not/be) gravity? 4. If I (make) that mistake again, I (not/do) it. 5. If there (not/be) gravity, no one would weigh anything at all. 6. Both the United States and Russia (choose) their astronauts carefully. 7. Have you ever dreamed of flying into space miles and miles above the earth? 8. All of them were happy about their jobs. 9. Gravity makes balls who are orbiting the earth weightless. 10. Don't believe whatever he says. He's just pulling your leg.