______to the world for help, Hollywood stars led a huge fundraising drive for Haiti.

A. Appealed                         B. To appeal                         C. To have appealed           D. Appealing

We appeal to all countries to ________ cooperation on climate change, food security and the prevention of natural disasters．

1. A.
   build up
2. B.
   put on
3. C.
   show off
4. D.
   hold out

We appeal to all countries to ________ cooperation on climate change, food security and the prevention of natural disasters．

1. A.
   attach importance to
2. B.
   lay stress in
3. C.
   put value for
4. D.
   hold up to

 We appeal to all countries to _____cooperation on climate change, food security and the prevention of natural disasters.

     A. build up                  B. put on                       C. show off                D. hold out