. Gun control is a subject Americans have argued for a long time .
| A．of which | B．with which | C．about which | D．into which |
.
This is Mr. Smith, ____ has something important to tell you.
A. who I think B. I think who C. he thinks D I think he
.
I _____ the boy to save money for the future, but he wouldn’t listen.
| A．hoped | B．suggested | C．made | D．advised |
.
The letters WHO _______ the World Health Organization.
| A．repreasented | B．meaning | C．stands for | D．stand for |
.
The conference has been held to discuss the effects of tourism _____ the wildlife in the area.
| A．on | B．in | C．at | D．with |
.
In order to make our city green, ____.
| A．it is necessary to have planted more trees | B．our city needs more trees |
| C．we must plant more trees | D．many more trees need to plant |