More and more people have lost their jobs. No one knows how long it will be before the nation _______ from its present trouble.
| A．returns | B．repairs |
| C．recovers | D．requires |
____ come again.
| A．Do | B．Can | C．May | D．Did |
I ____ see him yesterday.
| A．really | B．do | C．did | D．does |
Is there anything else ____ you want to get ready for the party this evening?
| A．which | B．that | C．who | D．what |
____ on Monday night that all this happened?
| A．Is it | B．It is | C．Was it | D．It was |
It was in the school ____ he had studied ____ he began the important experiment.
| A．that; where | B．in which; which |
| C．where; that | D．where; in which |