As the sea ice melts sooner each swimmer,polar bears are forced to come ashore earlier and face food shortages _____ they have stored enough fat to last them through the season.
| A．before | B．unless | C．since | D．until |
Rather than _________ on a crowded bus, he always prefers ________ a bicycle.
| A．ride; ride | B．riding; ride | C．ride; to ride | D．to ride; riding |
We’re looking forward __________ the photo exhibition.
| A．to visiting | B．to visit | C．to having visited | D．visiting |
You will _______ your health if you work so hard，eat a little food and sleep badly．
| A．fail | B．improve | C．help | D．endanger |
My brother，______ his classmates often made fun a few years ago，is now studying in England．
| A．of whom | B．who | C．about whom | D．whom |
一Do you think I should apply for the job?
一Why not? If you make an effort，the _______ are that you’11 be employed．
| A．results | B．hopes | C．wishes | D．chances |