—It is said that John’s paper got an A.
—He deserves it．He _________ a lot before he handed it in.
A．prepared B．prepares
C．had prepared D．has prepared
In the past few years, so many areas throughout the world have been hit by such destructive earthquakes, snowstorms and tsunamis ________ we have never experienced before, ________ makes us worried a lot about nature disasters.
| A．that; that | B．as; which | C．which; it | D．when; as |
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; / |