.People who do not smoke have less ____________ of suffering from lung cancer than those who do so.
| A．potential | B．cause | C．hope | D．choice |
I like _____ in spring when everything turns green and active.
| A．one | B．it | C．that | D．this |
You can imagine what difficulty we had __________ home in the snowstorm.
| A．walked | B．walking | C．to walk | D．walk |
We hurried to the station, ________ the train was gone.
| A．to find | B．finding | C．found | D．only to find |
.Operation rooms should be kept free ______ bacteria of any kind.
| A．with | B．for | C．from | D．to |
.The League Secretary and monitor ______giving a speech while the rest of the class ________ listening attentively.
| A．were, were | B．was, was | C．were, was | D．was, were |