The field research will take Joan and Paul about five months; it will be a long time _________ we meet them again.
| A．after | B．before | C．since | D．when |
Doctors have said that as many as 50% of patients don’t take medicine ______.
| A．like directed | B．to be directed |
| C．as directed | D．so that directed |
Only when he returned _______ that the war had ended and the army had come back.
| A．we tell | B．we told |
| C．did we tell | D．were we told |
There are many wonderful theme parks in America, _ _ Disneyland in California is my favorite.
| A．for which | B．with which |
| C．of which | D．in which |
Bears ______ fat stores throughout the summer and fall to have energy enough to last them through their winter sleep.
| A．pack up | B．build up |
| C．bring up | D．take up |
The _______ on his face told me that he wasn’t satisfied with my answer.
| A．impression | B．sight |
| C．appearance | D．expression |