根据中文意思完成句子。

1. 对不起，我迟到了。

    I'm sorry I ________ class.

2. 迈克，放学后和我一块去购物怎么样？

    ________ going shopping with me after school, Mike?

3. 我每天都花半小时步行上学。

    ________ 30 minutes to walk to school every day.

4. 学生们都在忙着为下周的考试做准备。

   All the students ________ the exam next week.

5. 刘先生过去总抽烟。直到病得严重了，他才戒烟。

    Mr Liu used to smoke a lot. ________ he was seriously ill.