It was proved that the problem __ partly in the air pollution.
| A．lies | B．lied | C．lay | D．laid |
It’s more than half a century _____ my grandfather joined the Party and became a servant to the people.
| A．when | B．that |
| C．since | D．while |
“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 |
Was it at five o’clock ______the fire broke out？
| A．when | B．that |
| C．which | D．in which |
Was it five o’clock ______the fire broke out？
| A．when | B．that |
| C．which | D．in which |
It was just in the room _____ he was born _____ he died.
| A．where, which | B．that, that |
| C．where, that | D．which, that |