By law,when one makes a large purchase, he should have _____ opportunity to change his mind.
A. accurate B. adequate C. urgent D. excessive
How long do you think it will be ________ the computer company puts forward a new product?
A. before B. since C. until D. that
The famous scientist, _______ a dinner party will be held tonight,is to arrive soon.
A. in honour of him B. in his honour C. in whose honour D. in which honour
__________twice a year, whether it is a car or bus or a truck, is the rule that every driver must obey in this city.
A．Examining B．Examined C．Being examined D．Having been examined
--- An ant has two stomachs --- one for itself, one for others.
--- Really? Quite interesting. I ____ anything about it.
A. don’t know B. have known C. haven’t known D. didn’t know
AIDS is said__________the biggest health challenge to both men and women in that area over the past few years.
A．that it is B．to be C．that it has been D．to have been
