No one knows exactly when our ancestors started talking, but new evidence suggests that____ might have happened a long time ago.
| A．which | B．what | C．it | D．they |
The oil must be used up, the light went out.
| A．for | B．because | C．since | D．as |
---Poor Tom! He will have to work all the next month.
---Luckily, the basketball games are held.
| A．except | B．except that | C．except when | D．except for |
I like traveling by sea it is not rough.
| A．unless | B．in case | C．as long as | D．although |
For miles around me there is nothing but a desert, without a single plant of tree .
| A．in sight | B． on the earth | C．at a distance | D．in a place |
It was easier to move about the fringe of the crowd.
| A．at | B．in | C．on | D．to |