单词拼写；根据下列句子及所给单词的首字母写出所缺单词。要求写出完整单词。（每空限填一词）
1. Many people like to s in the sea during summer..
2. From now on, I’ll study hard to make my d come true.
3. Be c . The knife is very sharp. It may hurt you.
4. Sometimes I walk to school, sometimes I r to school.
5. I have no time to see a film with you. I’m b with my work.