— does it take you to watch TV?
—About forty minutes.
| A．How long | B．How much | C．How often | D．How many |
Itis ______ to have achieved so much in such a short time.
| A．something | B．anything | C．nothing | D．everything |
In fact, the renovation is just one move in a huge project to improve Chinese teachers’ housing ______ in recent years.
| A．situations | B．equipment | C．circumstances | D．conditions |
A curve is a line ______ no part is straight and which has no angle.
| A．that | B．whose | C．in which | D．of which |
Research shows that humans ______ from selfish to unselfish behavior when they are watched.
| A．tell | B．switch | C．range | D．distinguish |
______ 6 world powers have accepted ______ Iranian offer for talks on its disputed nuclear program.
| A．The; a | B．不填; an | C．The; an | D．不填; a |