Something must be done to prevent our city ____ by thick smoke.
A.to be polluted | B.from polluting | C.from being polluted | D.polluting |
.A great number of students said they were forced to practise the piano.
A.to question | B.to be questioned |
C.questioned | D.questioning |
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 |