46. We won’t go out unless it stops raining. A. If it stops raining, we won’t go out. B. If we go out, it will stop raining. C. If it doesn’t stop raining, we won’t go out. D. We would go out if it didn’t stop raining. 47. People should use energy-saving bulbs to save electricity. A. Energy-saving bulbs to save electricity should use. B. Energy-saving bulbs should be used to save electricity C. Energy-saving bulbs should use to save electricity D. Energy-saving bulbs to save electricity should be used. 48. They have taught English in this country for years. A. English has been taught them in this country for years. B. English has been taught in this country for years. C. English have been taught in this country for years. D. English has been teaching in this country for years. 49. He learned to drive when he was eighteen. A.His father made him drive when he was eighteen. B.He could drive when he was eighteen, but he didn’t. C.He has been using his car since he was eighteen. D.He has driven since he was eighteen. 50. In spite of the bad weather, they had a wonderful holiday. A. Although the bad weather, they had a wonderful holiday. B. Although the weather was not good, they had a wonderful holiday. C. Although the weather was bad, they didn’t have a wonderful holiday. D. Although the weather was not bad, they had a wonderful holiday.