Everybody has ______ responsibility to save water, if future generations are to enjoy _____ similar standard of living to the one we enjoy now.
| A．the; / | B．a; a | C．/; the | D．a; the |
．The patient was warned ______ only food after the operation．
| A．to eat not | B．eating not | C．not to eat | D．not eating |
.We have been told that under no circumstances_______ the office telephone for personal affairs.
| A．may we use | B．we can use | C．we could use | D．did we use |
.Because of the heavy sandstorm, we had to put off the visit until tomorrow to the exhibition of painting _____in the nearby city.
| A．to hold | B．held | C．holding | D．being held |
.He wondered if he could slip out of the lecture hall without anyone______.
| A．noticing | B．noticed | C．to notice | D．being noticed |
._____in a well—known university is what everybody wishes for.
| A．Educated | B．Being educated | C．To educate | D．Educating |