用 since 和 for 填空 1. _ two years 2._ two years ago 3. _ last month 4._ 1999 5._ yesterday 6. _ 4 oclock 7. _ 4 hours 8._ an hour ago 9. _ we were children 10._ she left here 11) We have learned five lessons （ ） the beginning of this term. 12) Mrs Liao has been in hospital （ ）last week. 13) I have stayed at my aunts （ ）two weeks. 14). He has lived in Nanjing _ the year before last. 15). Ive known him _ we were children. 16). Our teacher has studied Japanese _ three years.17). She has been away from the city _ about ten years. 18). Its about ten years _ she left the city.
