—It’s smoggy these days. That’s terrible!

—Yes, I hope to plant trees. ______ trees, ______air pollution.

A. The more; the fewer

B. the less; the more

C. The less; the fewer

D. The more; the less

School students ________ smoke because it is against the school rules.

A．needn’t        B．couldn’t      C．won’t        D．mustn’t

_____ great fun it is to make a snowman in winter.

A. What           B. What a           C. How          D. How a

The flight to London was          because of the heavy snow.

A. put up       B. put out

C. put off         D. put away

Tom is weak in physics. He always feels _______ before he takes a physics test.

A. interested         B. comfortable

C. nervous           D. proud

Ann is a careful girl. She always goes over her exercises to____ there are no mistakes．

A．look for        B．make sure

C．find out       D．think about

To be healthy, one must have at least _____ sleep every day.

A．eight hours     B．eight hour’s

C．eight-hour’s    D．eight hours’

There are forty students in Class Four. And        of them        girls.

A. two three, is      B. two thirds, is

C. second threes, are      D. two thirds, are

The Greens left         London         a sunny morning.

A. to, in         B. to, on

C. for, on       D. for, in

Your Ipad is quite nice. Where did you buy______? I want to buy______, too．

A．one; one      B．it; one       C．it; it         D．one; it