根据下列句子及所给的首字母,写出各单词的正确、完全形式(每空限填一词)。
1.I like s________ because I enjoy swimming.
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2.Sarah went c________ with her friends last Sunday.
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3.The blue whale is h________ than the elephant.
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4.My mother r________ a bike to work yesterday.
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5.Little Tom often visits h________ grandparents on the weekends.