It is dangerous for people ______ the streets if they don’t ______ the traffic rules.
A. to cross; observe
B. across; follow
C. crossing; carry out
D. cross; remember
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Would you mind ______ me here at nine o’clock?
A. meet
B. to meet
C. meeting
D. met
When we are ______ trouble they often help us.
A. in
B. on
C. with
D. without
I was so sleepy that I could hardly keep my eyes ______ yesterday evening.
A. opening
B. open
C. to be opened
D. to open
There are many young trees on _______sides of the road.
A. every
B. each
C. both
D. all