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Li Ming is so careful that he always looks over his exercises to ______ there are no mistakes.
11个月前
—Hi, sir, may I __ seats with you? I want to sit next to my mother. —With pleasure.
11个月前
30名学生参加数学竞赛,已知参赛者中任何10人里都至少有一名男生,那么男生至少有______人.
1年前
Experts believe_______people can waste less food by shopping only when it is necessary.
1年前
1年前