完成句子（每空1分，共10分）
Li Lei does his homework at seven. (改为否定句)
Li Lei ________ ________ his homework at seven.
His sister had lunch at school yesterday. (改为一般疑问句)
_________ his sister _________ lunch at school yesterday?
The sweater costs 200 yuan .(划线提问)
_______ _______ does the sweater cost?
要下雨了.你最好带把伞.
It is going to rain.              Take an umbrella with you.
我们俩都不知道他的电话号码。
_______of us ______ his telephone number