1 . Studio heads realized that they couldn’t make virtually the same film over and over again with the same __________ of stars and still expect to keep turning a profit.

A．cast

B．staff

C．actors

D．celebrities

2 . Nature has always been a ______ of inspiration for poets and writers throughout history.

A．source

B．shelter

C．barrier

D．background

3 . —How can I believe you can pay the debts on time?
—I’d like to offer my house as a ______.

A．guarantee

B．symbol

C．promise

D．permission

5 . When giving first aid, we should give top ________ to those in the most serious situations.

A．priority	B．potential
C．criticism	D．elements

6 . —Why do so many Indian companies want her to work for them?
—She can deal with foreign customers very well. It’s her ________.

A．decision

B．shortage

C．satisfaction

D．advantage

7 . —Did you take your          yesterday at home?
—Yes, I did. It was 37℃.

A．appointment

B．temperature

C．homework

D．application

8 . —What does _________ come from?
—It’s from sheep.

A．silk

B．cotton

C．ship

D．wool

9 . These biological discoveries all help us understand the ________ for life on our planet, even in the most extreme circumstances.

A．component

B．coverage

C．capacity

D．comprehension

10 . The valley was covered with a________ of heavy mist.

A．piece

B．bar

C．bunch

D．blanket