His report was so exciting that it was __ interrupted by applause（掌声）.
| A．constantly | B．constant | C．seldom | D．never |
He gave me some very __________ advice on buying a house.
| A．precious | B．worthy | C．precise | D．valuable |
It was necessary to __________ the factory building as the company was doing more and more business.
| A．extend | B．increase | C．lengthen | D．magnify |
Leaves are found on all kinds of trees, but they differ greatly __________ size and shape.
| A．on | B．from | C．by | D．in |
__________ what the six blind men said sounded! I can't help laughing!
| A．How foolishly | B．How foolish |
| C．What foolishly | D．What foolish |
—Doctor, it seems you like to work with animals.
—Yes, I think animals should __________ as our friends.
| A．regard | B．regarded | C．to regard | D．be regarded |