I will be surprised if you can get Calvin, who is very mean, ______ these donation draw tickets from you．
A. buy B. buying C. buys D. to buy
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
