We should have teamspirit but there are a few occasions_____members are uncertain of their roles.
_____ the front door ___ , he had to enter the room through the back door.
By law,when one makes a large purchase, he should have _____ opportunity to change his mind.
How long do you think it will be ________ the computer company puts forward a new product?
The famous scientist, _______ a dinner party will be held tonight,is to arrive soon.
__________twice a year, whether it is a car or bus or a truck, is the rule that every driver must obey in this city.