We were about to climb up to the top of the mountain ________ it began to rain heavily.
| A．as | B．while | C．when | D．since |
—The 3D cinema provides a brand new experience of ________ space.
—Yes. You can even take ________ journey to the end of the solar system.
| A．a; a | B．/; a |
| C．the; the | D．/; the |
I have had such a case __________a boy whispered to his classmate now and then while I was having lessons.
| A．as | B．that |
| C．which | D．where |
So difficult __________ it to work out the problem that I decided to ask Tom for advice.
| A．I did find | B．did I find |
| C．I have found | D．have I found |
What will happen to the children if Jim and Mary __________？
| A．break up | B．break down |
| C．break out | D．break in |
__________ by a group of journalists and __________ to nobody for help, the famous actress finally covered her face with a hat.
| A．Surrounded; turning | B．Surrounded; turned |
| C．Surrounding; turning | D．Surrounding; turned |