It was quite a long time ______ he really realized the serious situation.
| A．since | B．when | C．after | D．before |
The shy girl sat there, ___ say anything.
| A．dare not | B．not daring to | C．not daring | D．didn’t dare |
They look forward to ___ China once again.
| A．visited | B．visit | C．visiting | D．visiting to |
These books are not allowed ___ away.
| A．to take | B．take | C．taking | D．to be taken |
Many new houses are said ___ already.
| A．have built | B．to build | C．to be built | D．to have been built |
___ in very good spirits, he worked harder than before.
| A．have built | B．to build | C．to be built | D．to have been built |