1 . Across the Yangtze River _____ more than one bridge, the Nanjing Changjiang Bridge being the first one.

A．lay	B．lie
C．lies	D．laid

2 . That’s why I help brighten people’s days. If you ________, who’s to say that another person will?

A．didn’t	B．don’t
C．weren’t	D．haven’t

3 . When and where this took place _____ still unknown.

A．is	B．has
C．were	D．are

4 . —Car prices have been going down sharply in the last 20 years.
—It's not surprising because the law of market ________ the price of a product.

A．is controlling	B．controls
C．has controlled	D．controlled

5 . The scientists predict that if present trends____, women in 400 years will be 2cm shorter and have healthier hearts．

A．will continue

B．continue

C．are continued

D．will be continued