The government _____ air quality in urban areas from level one to five: excellent, fairly good, slightly polluted, poor and dangerous.
A. arranges | B.classifies | C.distributes | D.divides |
The weather turned out to be fine yesterday. I_____ the trouble to carry my umbrella with me.
A.should have taken | B.could have taken | C.needn't have taken | D.mustn't have taken |
I was about to leave the office ______ an unexpected visitor came.
A. while B. as C when D. before
It was a matter of ________ would take the position.
A.who | B.whoever | C.whom | D.whomever |
People try to avoid public transportation delays by using their own cars, and this ____ creates further problems.
A.in turn | B.in all | C.take turns | D.by turns |
After the new technique was introduced, the factory produced_____ cars in 2008 as the year before.
A.as twice many | B.as many twice | C.twice as many | D.twice many as |