1．A．There is going to be a money-raising activity next week． B．A money-raising activity was held last week． C．A money-raising activity is going to take place this weekend．
8．A．They are going to London tomorrow morning． B．They started early in the morning to go to London． C．They are thinking about going to London as early as possible．
18．A．He is a good student and he is seldom late for school． B．He is a good student and he is never late for school． C．He is a bad student and he is always late for school．
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