The boys were happily making a snowman, _________ with cold.
| A．their faces red | B．their faces were red |
| C．their faces to be red | D．their faces turned red |
—Who are making so much noise in the garden？
—_______ the children.
| A．It is | B．They are |
| C．That is | D．There are |
It was lack of money, not of effort, _____ defeated their plan.
| A．which | B．as |
| C．that | D．what |
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 |