What do you usually use your computer _________ ?
| A．in | B．with | C．for | D．to |
He fell off the bike ________.
| A．while he rode | B．while he was riding |
| C．while he is riding | D．while on bike |
My sister isn’t in. ________ she comes back, I’ll let her call you back.
| A．While | B．Until | C．Before | D．When |
She got up early this morning _________ she could catch the first bus.
| A．because | B．so that |
| C．in order to | D．when |
The twin sisters have learned a lot ________ they came to China.
| A．when | B．after | C．since | D．as soon as |
If it tomorrow, we to climb mountains.
| A．doesn’t rain; go | B．won’t rain; will go |
| C．won’t rain; go | D．doesn’t rain; will go |