A group of middle school students spent two weeks _____ the jungle.
| A．trekking through | B．trekking across | C．to trek across | D．to trek through |
—A travel may be good for your health .
—Maybe, but I have ______ money______ time to do that .
A. neither; nor B. both; and C. either; or
In some places trees ______ to stop the wind from blowing the earth away.
A. will plant B. planted C. are planted
When I knocked at the door , I heard her______ in the room .
A. sings B. singing C. to sing
Taiwan Island is______ the southeast of China.
A. in B. on C.to
There ______ the bell. It’s time for class.
A. goes B. comes C. gets