The boy is waiting ____ his sister and they will go to the hospital to wait ____ their sick mother.
| A．for,on | B．on,for | C．for,for | D．on.on |
When I talked with my grandma on the phone, she sounded weak, but by the time we ___ up, her voice had been full of life.
| A．were hanging | B．had hung | C．hung | D．would hang |
. Gun control is a subject Americans have argued for a long time .
| A．of which | B．with which | C．about which | D．into which |
It is generally said that man’s desire is hard _______.
| A．to satisfy | B．to be satisfied | C．to met | D．to being satisfied |
Every evening after dinner, if not________ from work, I will spend some time walking my dog.
| A．being tired | B．tiring | C．tired | D．to be tired |
Doctors recommend that all children ________ vaccinated against measles(麻疹).
| A．should | B．could be | C．are | D．be |