A huge _____ of quilts was needed in Qinghai province since it was freezing at night.
| A．number | B．plenty | C．quantity | D．quality |
.A powerful earthquake struck Haiti, ______ tens of thousands of homeless and buried in ruins.
| A．left | B．to leave | C．leaving | D．being left |
.All of the ski resorts are ____ from the hotel via free public transportation.
| A．available | B．accessible | C．present | D．probable |
In our class, when the bell rang and the teacher closed his book, it was a ____ for everyone to stand up.
| A．sign | B．chance | C．mark | D．signal |
.Mary felt ______from the outside world, since she lacked an Internet connection and couldn’t receive any e-mail.
| A．cut down | B．cut in | C．cut off | D．cut out |
I have been looking for Michael for a whole day. Where ______ he have gone?
| A．should | B．can | C．must | D．may |