___the clouds, you would find the airplane in the sky easily
| A．Had it not been for | B．If it were not | C．If it had not been for | D．Were it not for |
.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 |
.______the photos of the coastal city, I have no desire to visit it,it’s crowded all year.
| A．To see | B．To have seen | C．Seeing | D．Having seen |
.._____your budget, keep a careful record of each dollars you spend every day.
| A．Follow | B．To follow | C．Following | D．Followed |