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2. 當時一個警察正在引導一些學生過馬路。

A policeman some students to cross the road at that moment.

1. 當我到達那兒時，消防隊員正在滅火。

When I arrived there,the firemen the fire.

5. —Look at the clouds,so beautiful!

  —Wow,so many different , horses,sheep,flow- ers...

   A. sizes   B. shapes   C. colors   D. styles

4. While Mary was listening to music,Jenny her room.

   A. cleans        B. cleaned

   C. was cleaning   D. will clean

3.  (2014 廣西南寧中考) The bell rang the teacher was explaining the experiment to the students.

   A. until   B. before

   C. while   D. after

2.  (2015 山東臨沂中考) Tim Cook called his mother every week even while he around the world.

   A. was traveling     B. is traveling

   C. traveled        D. travels

1.  ( 2015 四川自貢中考) 一What were you doing when I phoned you yesterday evening?

   —I was doing homework while my parents dinner, grandma.

   A. cooked   B. cook   C. were cooking

   B. 根據(jù)圖畫和提示詞，寫一個符合圖意的完整、正確的 句子。

1.

2.

3.

4.

5.

5. Look!The milk (mix) with the white flour.

4. 1 think there (be) less pollution in the future.