As is known to all language learners, newly learnt words will soon be forgotten unless ______ used in everyday communication.
A. exactly B. finally C. gradually D. frequently
Many students listened to the lecture, but I wondered how much they ______.
A. took out B. took up C. took off D. took in
I think that something has to be done to stop the air from being polluted, ______ ?
A. doesn't it B. don’t I C. don't they D. haven't they
It has been reported that some government leaders ______ their authority and position to get illegal profits for themselves.
A. overlook B. employ C. abandon D. abuse
Let's learn to use the problem we are facing ______ a stepping-stone to future success．
A. to B. for C. as D. by
His novels sell best and have made him famous, but before that no one could have imagined how great a role he ______ in the literary world．
A. had played B. has played C. is playing D. was to play
