3. We must do something to save the wild animals.

Something must               to save the wild animals by us.

2. We heard our English teacher sing in the office just now.

Our English teacher                             in the office just now by us.

将下列句子改为被动语态

1. The foreign friends gave us some wonderful stamps.

(1)                      some wonderful stamps by the foreign friends.

(2) Some wonderful stamps                      by the foreign friends.

(   ) 5. ―The shoes are very nice. I'll take.them.

―You'd better        first. I'm afraid the size is a bit small for you.

   A. pick for up   B. take them off

   C. put them on   D. try them on

(   ) 4. China's hot words,like tuhao， dama and lianghui        on the Western media.

   A. use widely   B. is widely used

   C. uses widely   D. are widely used

(   ) 3. —Excuse me,what's this for?

―It's a cleaner and it        to pick up dirt.

   A. uses   B. is used   C. is using   D. used

(   ) 2. Tom        as the monitor of our class.

   A. chose   B. chooses

   C. was chosen   D. has chosen

(   ) 1. Sometimes parents find        difficult        with their teenage children.

   A. that;talk   B. it;to talk

   C. this;talking   D. it;talk

6. It is necessary for us       (understand) the importance of health care.

5. Trees and flowers       (plant) every year to make our country- more beautiful.