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.
2.Sarah went c________ with her friends last Sunday.
3.The blue whale is h________ than the elephant.
4.My mother r________ a bike to work yesterday.
5.Little Tom often visits h________ grandparents on the weekends.