Keep up good state of mind even if you___________ fail plenty of times.
| A．must | B．will | C．can | D．should |
I didn’t like the color of the coat my mother bought me, so she went back to _______ it for another one.
| A．replace | B．exchange | C．afford | D．measure |
He was seriously injured in the traffic accident. _______ is now no possibility _____ he will make a full recovery.
| A．It; whether . | B．It; that | C．There; whether | D．There; that |
At night, plants _________carbon dioxide and at the same time _________oxygen. So, we may put some in our bedrooms to purify the air.
| A．take in, give out | B．take up, give off |
| C．take in, give in | D．take off, give up |
Only when I left home to go to college ___ how much my mother had done for me.
| A．did I realize | B．I realized | C．had I realized | D．I had realized |
For many cities in the world, there is no room to spread out farther, _____New York is an example.
| A．for which | B．in which | C．of which | D．from which |