2. 当时一个警察正在引导一些学生过马路。

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

1. 当我到达那儿时，消防队员正在灭火。

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 广西南宁中考) The bell rang the teacher was explaining the experiment to the students.

   A. until   B. before

   C. while   D. after

2.  (2015 山东临沂中考) 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 四川自贡中考) 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. 根据图画和提示词，写一个符合图意的完整、正确的 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.