The exhibition _____ such endangered animals as the giant panda and the Siberian tiger and describes the work being done to protect them．
| A．exploits | B．features |
| C．demonstrates | D．inspects |
We all know that, __________, the situation will get worse.
| A．not if dealt carefully with | B．if not carefully dealt with |
| C．if dealt not carefully with | D．not if carefully dealt with |
—Have you known Dr. Jackson for a long time?
—Yes, since she ______ the Chinese Society.
| A．has joined | B．joins | C．had joined | D．joined |
I like getting up very early in summer. The morning air is so good ______.
| A．to be breathed | B．to breathe | C．breathing | D．being breathed |
The lawyer rarely wears anything other than jeans and a T-shirt ______ the season.
| A．whatever | B．wherever | C．whenever | D．however |
Let’s learn to use the problem we are facing ______ a stepping-stone to future success.
| A．to | B．for | C．as | D．by |