Many old houses have been to make way for new roads.
| A．torn up | B．torn down | C．torn into | D．torn off |
________ we have enough evidence，we can't win the case.
| A．Once | B．As long as | C．Unless | D．Since |
He is so busy.He cannot afford enough time with his son________he wants to.
| A．even if | B．as if | C．because | D．before |
I have heard a lot of good things about you ________ I came back from abroad.
| A．since | B．until | C．before | D．when |
________I have to give a speech，I get extremely nervous before I start.
| A．Whatever | B．Whenever | C．Whoever | D．However |
Mark needs to learn Chinese________his company is opening a branch in Beijing.
| A．unless | B．until | C．although | D．since |