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Ⅰ. 单项选择 1. You can’t imagine what difficulty we had ＿＿＿ home in the snowstorm. A. walked B. Walk C. to walk D. Walking 2. As a result of destroying the forests, a large ______ of desert ＿＿＿ covered the land. A. number; has B. quantity; has C. number; have D. quantity; have 3. —I am sorry to have kept you waiting. ? ______, Bill. A. You are welcome B. Go ahead C. Don’t mention it D. No problem 4. As you can see, the number of cars on roads ______ rising these days. A. was keeping B. keep C. keeps D. were keeping 5. If not ______ with practice, a theory will be useless. A. combined B. connected C. combine D. connect 6. Food and clothes are in ______ after the earthquake happened. A. requirement B. demand C. request D. require Ⅱ. 完成句子 1. We are ______（感激）to you for your timely help. | 
