While crossing the street, please ________ for the coming cars.
—Since you like the car so much,why not buy it?—________,I can't afford it.
The girl had hardly rung the bell ________ the door was opened suddenly,and her friend rushed out to greet her.
Mary made coffee ________ her guests were finishing their meal.
As is reported,it is 100 years ________ Qinghua University was founded.
I'm sorry you've been waiting so long,but it'll still be some time ________ Brian gets back.(2008·北京)