Cars play an important role in modern life, but they_______also cause many problems like air pollution．
| A．should | B．can | C．must | D．Will |
—These boxes are too heavy for him to carry.
—Here, I’ll give you a hand________them.
| A．for | B．to | C．with | D．by |
I was on the point of going to bed ________ Mr. Zhang rang me up.
| A．as | B．when | C．while | D．and |
It’s really cold________July in Beijing now. Better put on your coat.
| A．in | B．during | C．for | D．to |
English is understood all over the world ________ Turkey is spoken by only a few people outside Turkey itself.
| A．while | B．because | C．unless | D．as |
My little brother kicked the ball to the river; I took great trouble to get it________the river.
| A．on | B．from | C．from on | D．over from |