In aerospace devices the weight of the necessary power producing equipment is _____.
| A．vital | B．possible | C．capable | D．reliable |
— How much__________the shoes?
—Five dollars__________enough.
| A．is; is | B．are; is | C．are; are | D．is; are |
A vast area north of the Yangtze River__________by the first heavy snow of the new year,causing difficulties to the post-festival road transport.
| A．were affected |
| B．was affected |
| C．had affected |
| D．has affected |
The excellent service of the waiters __________highly praised.
That’s why the restaurant is always full of people.
| A．were | B．are | C．was | D．is |
There has been a great increase in bicycle sales this year________?
| A．does there | B．isn’t there | C．hasn’t there | D．isn’t it |
Many people like white color as it is a ________ of purity.
| A．symbol | B．sign | C．signal | D．example |