用括号中多给单词的适当形式完成下列句子。每空格限填一词)
1.I am used to brushing my________twice a day. (tooth)
2.These two beds are in________sizes. (difference)
3..Take your teacher's________, and you'll make progress. (advise)
4..Sometimes it is hard for the old to keep healthy because of the sudden________changes.(season)
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