More cycles have been shared in our city, ________ it much easier for the bus drivers to drive on the road.
A. having made
B. made
C. be made
D. making
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You can spend three days ______ the rainforest with a local guide.
A. explore
B. to explore
C. exploring
D. explode
With time _________, I gradually realize the importance of health.
A. goes by
B. to go by
C. going by
D. went by
Look ! The building ________ now is our teaching building .
A. being built
B. built
C. to be built
D. building
There must be many people ________ for the train at the train station because of the snow.
A. wait
B. waited
C. to wait
D. waiting