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的考试做准备。 All the students ________ the exam next week. 5. 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.