With so many exercises ________， the students are having a hard time.
| A．finished | B．finishing |
| C．to finish | D．being finishing |
As far as we know, traveling in space has been made with the development of science and technology.
| A．it was possible | B．it possible | C．possible | D．that possible |
After reporting the accident to the police, the couple hurried off and in the crowd.
| A．was lost | B．were lost | C．had lost | D．lost |
So far there is no proof people from other planets do exist.
| A．how | B．what | C．which | D．that |
Color shapes our view of world and it may have far greater influence on our lives than many of us realize.
| A．a; a | B．the；不填 | C．the; the | D．the; a |
There is still much room for improvement in our work, I see it.
| A．because | B．since | C．which | D．as |