—May I smoke here? —________, you ________. It can be dangerous.
| A．Yes, can | B．No, can’t | C．Yes, may | D．No, needn’t |
She said she had some trouble ___________ her homework.
| A．finish | B．finishing | C．to finish | D．Finished |
Do you enjoy __________ on the Internet?
| A．surfing | B．surf | C．to surf | D．surfed |
He learns English by ____________ English songs.
| A．listen | B．listen to | C．listening | D．listening to |
It _________ us about two hours _______ that picture last night.
| A．took; to finish | B．spends; to finish | C．takes; finish | D．spent; spent |
There are so many kinds of radios in the shop. I can’t decide _________.
| A．to buy what | B．to buy which | C．which to buy | D．when to buy |