Air pollution is becoming than ever before, so many families prefer to buy electric cars。

A. serious B. more serious

C. more seriously D. the most seriously

A： have you talked with your friends on Wechat？

B：Since I came back from the post office.

A. How far B. How often

C. How soon D. How long

People throughout the world together now to protect the natural environment.

A. are working B. worked

C. will work D. have worked

We all believe you will succeed in working out the problem you give up.

A. if B. because

C. since D. unless

helpful advice you you gave us on protecting personal information the other day！

A. What B. What a

C. What an D. How

In my eyes, one of the best ways to lose weight is regularly in your daily life.

A. exercise B. to exercise

C. exercises D. exercised

More than twenty students in that university abroad to study medicine last year.

A,sent B.were sent

C.had sent D.had been sent

A：Have you seen Mrs. Smith lately？

B：No, She Australia for business. She will come back in two days.

A. has come to B. has gone in

C. has gone to D. has been to

Keep reading English regularly, your reading skills will be improved quickly.

A. practice B. practicing

C. to practice D. practiced

一Have you heard of the big fire that broke out on Huaguo Mountain at Qingming Festival

一Yes. Luckily, hundreds of firemen went there and the fire immediately.

A. put off B. put away

C. put down D. put out