To begin with, I was____of his promise, but I was soon convinced by his practical actions.
A. calm B. fierce C. sceptical D. patient
In the dark I could see a man lying on the floor, ____up with rope, which was____.
A. tied; terrified B. tied; terrifying
C. was tied; terrified D. was tied; terrifying
Recent research has____the natural mystery, which has amazed the world.
A. got a kick out of B. got stuck in
C. thrown light on D. made sense of
（2017·江苏卷·单项填空） He hurried home, never once looking back to see if he ____________.
A. was being followed B. was following
C. had been followed D. followed
I bought my mother a present and wished to give her a surprise on her birthday, but my father____the secret.
A. put away B. put off C. gave away D. gave off
In my opinion, the key ____air pollution is to inspire people to take public transport in big cities.
A. reduced B. reducing C. to reduce D. to reducing
