请选用for或since填空 1._________2000 2._________ half an hour 3._________ I was born 4._________ half an hour ago 5._________last month 6._________ eight o’clock 二.用for/since将句子补充完整 1. He has lived in Zhenjiang ________ the year before last. 2. I’ve known him __________ we were children. 3. Our teacher has studied Japanese_________ three years. 4. She has been away from the city___________ about ten years.