——This wall of air is an effective answer to the problem and it ____ work.
——But it is a question to put such a wall of air around the statue.
| A．may | B．must | C．should | D．could |
In order to increase their vote, they _________ another candidate a traitor to the country.
| A．announced | B．declared | C．thought | D．conquered |
Jade is the highest award in Chinese culture and medals are the most important prize in Olympics, so medals with jade is the perfect _________ to present the Olympics in Beijing.
| A．connection | B．cooperation | C．combination | D．composition |
There is an obvious _________ between the cultures of the west and East.
| A．content | B．contract | C．contrast | D．contact |
The happiest people are not those ________ have the best of everything, but ________ make the best out of everything.
| A．who, that | B．who, who | C．that, who | D．that, that |
Many pregnant women have bought this kind of clothes to ________ radiation.
| A．block | B．protect | C．distinguish | D．guarantee |