题目：
用所给词的适当形式填空。
小题1: My aunt goes shopping ____________（two) a week.
小题2: A lot of ____________ (visit) visited our school last year.
小题3: Mary had much fun ____________ (play) at the aquarium with her mother two weeks ago.
小题4: I think math is the ___________ ____________ (important) of all the subjects.
小题5: Please don’t forget ___________ ____________ (finish) your homework first.
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
的通解是y=______．