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单项选择 1. Health problems are closely connected with bad eating habits and a ______ of exercise. A. limit B. lack C. need D. demand 2. He demanded that the laboratory report ______ immediately after the experiment was done. A. was written B. be written C. must be written D. would be written 3. Some students ______their hands, showing that they had questions to ask. A. put B. raised C. rose D. lifted 4. He ______ his voice so that everybody in the room could hear him. A. lifted B. held C. rose D. raised 5. The new plant can’ t ______ the cold weather, so the researchers are trying to deal with it. A. suffer for B. suffer C. long for D. suffer from 6. ______ such heavy pollution already, it may now be too late to clean up the river. A. Having suffered B. Suffering C. To suffer D. Suffered 7. —Will he be back very soon？ —______. A. I expect it B. I don’t expect it C. I expect not | 
