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课时作业(二十五) [必修5 Unit 5 First aid] [限时：45分钟] Ⅰ.单项填空 1．—I'm sorry I can't go to your party tonight. —________？ Haven't we agreed on it? A．What is it B．Why don't you C．What do you think D．How is it 2．They are having a meeting, so they are busy ________. A．at present time B．at the present times C．at present D．in the present 3．They tried to prevent the crops from ________. A．injury B．injuring C．being hurt D．being injured 4．We don't keep winning games ________ we keep playing well. A．because B．unless C．when D．while 5．We were swimming in the lake ________ suddenly the storm started. A．when B．while C．until D．before 6．There is no ________ in trying to talk George into joining us. He enjoys being alone. A．doubt B．wonder C．hope D．point 7．As she ________ the newspaper, Granny ________ asleep. | 
