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111.完成句子1To make sure that he was at home, I called him up in_advance (事先)2She may come with us provided_that (假如) she arrives in time.3In_addition (除了) to these arrangements, extra ambulances will be on duty until midnight.4The discussion focused_on (集中于) three main problems which drew attention of most people.5Come and sign_up (报名), and you will get a great chance.单项填空1All their attention was _ on how to solve the problems _ polluted rivers and poisonous gas.Aabsorbed; and so onBfocused; such asCpaid; as Dlost; for example解析：选B。考查词组辨析。句意：他们所有的精力都用在怎么解决例如河流污染和有害气体的问题上了。由attention和on得知第一个空用focus；第二个空表示举例说明，如用for example，后要有逗号隔开。2Ill go to America to improve my English _ it isnt too expensive.Aexcept BprovidedCassumed Dunless解析：选B。句意：如果不是太昂贵的话，我要去美国提高一下我的英语水平。provided充当连词，表示“假设，如果”。111
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