Prices of daily goods ______ through a computer can be lower than store prices.
| A．are bought | B．bought | C．been bought | D．buying |
In my opinion, Jack, though relatively stubborn, was not too difficult ___.
| A．to work with | B．working with | C．to be worked with | D．worked with |
Having heard the touching stories of “the most beautiful teacher”, she ____tears .
| A．burst out | B．made out | C．burst into | D．made into |
Wang Lin failed to be admitted by Hong Kong University last year, and only then _______ the importance of English.
| A．he finally realized | B．he had realized |
| C．did he realize | D．had he realized |
---I regret _____you John has been fired．
---I can hardly believe my ears．He’s such a fine worker．
| A．telling | B．having told | C．to tell | D．to have told |
---Alice, you look puzzled, Have you understood it?
---Yes．I _____another problem just now．
| A．l have thought of | B．am thinking of |
| C．had thought of | D．was thinking of |