_____ private cars are bringing us convenience, they may also cause more traffic accidents and pollution.
| A．While | B．As | C．If | D．Since |
I don’t think it is __________taking the trouble to explain the question to him.
| A．worth | B．worthy | C．worth of | D．worthwhile |
With trees and grass__________39.6% of the urban area，the city has taken on a new look.
| A．covering | B．covered | C．to be covered | D．being covered |
The elderly _________ good care of in public places like supermarkets and airports; they are likely to get lost.
| A．can have been taken | B．ought to be taking | C．must be taken | D．should take |
Susan, _______ university student from Europe, teaches me _________ art in her spare time.
| A．an; / | B．a; the | C．an; the | D．a; / |
--- Would you mind if I turn on the radio and listen to some music?
--- ________. In fact, I also like to listen to music in my car.
| A．No, go ahead | B．Yes, I would | C．No, you can’t | D．Yes, no problem |