—Peter looked tired and a little absent-minded in class．
—He _____ too late．
| A．may stay up | B．could stay up |
| C．should have stayed up | D．must have stayed up |
The old man tried to save more money ______ he could contribute some to the flood victims.
| A．so as to | B．now that |
| C．so that | D．even though |
The manager suggested the workers’ pay ______ by 10 percent.
| A．should increased | B．would be increased |
| C．increased | D．be increased |
The spokesman said that the poor safety standards were ______ for last Sunday’s accident.
| A．blaming | B．blamed |
| C．to blame | D．to be blamed |
It was ______ that caused her to serve dinner an hour later than usual.
| A．us being late | B．our being late |
| C．we were late | D．because we were late |
Neither I nor Amy ______ to attend the business conference if we are busy.
| A．was | B．were | C．is | D．are |