When he came back from abroad，our country was ________with Japan.
| A．at a war |
| B．at war |
| C．at the war |
| D．on war |
—Was it under the tree ______ you went away talking to a friend?
—Sure. But when I got back there, the bike was gone.
| A．that | B．when | C．where | D．while |
Whitney Houston’s sudden death suggests that drug abuse is such a serious problem ______ we should deal with properly.
| A．as | B．that | C．which | D．where |
The argument is extremely heated ______ there are necessary conditions of existence such as water on the Mars.
| A．that | B．whether | C．if | D．which |
In my home breakfast ______ at 7 o’clock, which has ______ unchanged for 20 years.
| A．ordered; lasted | B．is served; remained |
| C．serves; stayed | D．is ordered; developed |
— It seems that you are familiar with this city.
— I ______ English in a high school here for three years. It' s great to be back!
| A．have taught | B．have been teaching |
| C．had taught | D．taught |