Which of the diagrams below shows the air temperature of Beijing in a year?
We will have no water to drink ________ we don't protect the earth.
| A．until | B．before | C．though | D．if |
—You bought the car about ten years ago?
—Yes.________ it's old，it still runs well.
| A．Because | B．Since | C．Although | D．But |
Mark isn't coming to the concert ________________ he has got too much work to do.
| A．so | B．until | C．although | D．because |
-When will you go back to your hometown? - _______.
| A．Until the work is finished |
| B．Not until the work is finished |
| C．After the work will be finished |
| D．As soon as the work will be finished |
— Was it under the tree ________ you were away talking to a friend?
— Sure. But when I got back there, the bike was gone.
| A．that | B．where |
| C．which | D．While |