__________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
______ only 20 minutes to go before the train left, I felt uneasy in the taxi to the railway station.
A. For B. With C. As D. Because
If you can make what the teachers teach ________, you’ll make rapid progress.
A. yours B. yourself C. you D. your
_______ has recently been done to provide more buses for the people, a shortage of public vehicles remains a serious problem.
A. What B. Though what C. In spite of what D. However what
