4. Look!Someone (clean) the room. How clean it is now!

3. If they (not be) careful enough,they may fail in the exam.

2. Till now,we still (not know) much about other stars.

三、 动词填空

1. I am looking forward to (receive) your letter.

() 6. Last year,   migrant workers (农民工) came to our town to find jobs.

   A. two thousands   B. two thousands of

   C. thousand of   D. thousands of

() 5. —Have you the changes of her telephone number?

       —Oh,no. Let me write the new number on my notebook.

   A. taken   B. watched   C. noticed   D. done

() 4. The visitors Suzhou for two days.

   A. have arrived in   B. have come to

   C. have got to   D. have been in

() 3. Have you ever Tom's story? He's really brave.

   A. heard from   B. heard of   C. talked to   D. talked about

() 2. The plane will carry you off to a city you have never .

   A. been to   B. gone to   C. visited to   D. travelled

二、单项填空

() 1. Italy is famous the Leaning Tower of Pisa.

   A. as   B. for   C. in   D. to