The woman was about to open the door ____________ she heard a strange sound from inside.
| A．as | B．while | C．when | D．then |
Find information in today’s world is not difficult. The _____ is how you can tell if the information is reliable or not.
| A．ability | B．competition | C．challenge | D．knowledge |
_____ to sunlight for too much time will do harm to one’s skin.
| A．Being exposed | B．Having exposed |
| C．Exposed | D．After being exposed |
To keep healthy, Professor Johnson________ cycling as a regular form of exercise after he retired.
| A．took up | B．caught on | C．carried out | D．made for |
Some experts say ____ birthrate of China, after the one-child policy is relaxed, can see ___ modest increase in future.
| A．the, a | B．a, a | C．a, / | D．the, / |
---Well, guess what! I came across my primary school teacher when I was visiting the Frick Collection in Manhattan.
--- Really? ________.
| A．It’s really a piece of cake. |
| B．It’s a small world. |
| C．It’s a long time. |
| D．It’s a once-in-a-lifetime chance. |