World Wildlife Fund (WWF)'s goal is to save the world's environment. The organization was set up ___21__September 11，1961. In the beginning, WWF worked __22__ the world's wildlife. Now, it works to save Earth__23___ its environment.
WWF has many tasks. One is to stop air pollution. Pollution from industry(工业)  and cars is _24_ to our environment. Each year, more and more trees are cut down __25__WWF tries to protect Earth's forests．Also people use more land, more and more animals are __26__ their homes and many die. WWF can buy important areas to __27__ the land from disappearing because of human development.
WWF has completed many projects. In China, WWF works to save pandas from  extinction（灭绝）． ___28__South America，it works to save the Amazon Rainforest.  Volunteers and donations help WWF complete its work. WWF's work is __29__to our environment, and is also important for people to help them __30__ time and money.

World Wildlife Fund (WWF)'s goal is to save the world's environment. The organization was set up ___21__September 11，1961. In the beginning, WWF worked __22__ the world's wildlife. Now, it works to save Earth__23___ its environment.

WWF has many tasks. One is to stop air pollution. Pollution from industry(工业)  and cars is _24_ to our environment. Each year, more and more trees are cut down __25__WWF tries to protect Earth's forests．Also people use more land, more and more animals are __26__ their homes and many die. WWF can buy important areas to __27__ the land from disappearing because of human development.

WWF has completed many projects. In China, WWF works to save pandas from  extinction（灭绝）． ___28__South America，it works to save the Amazon Rainforest.  Volunteers and donations help WWF complete its work. WWF's work is __29__to our environment, and is also important for people to help them __30__ time and money.

World Wildlife Fund (WWF)'s goal is to save the world's environment. The organization was set up 1September 11，1961. In the beginning, WWF worked 2 the world's wildlife. Now, it works to save Earth3 its environment.
WWF has many tasks. One is to stop air pollution. Pollution from industry(工业) and cars is 4 to our environment. Each year, more and more trees are cut down 5WWF tries to protect Earth's forests.Also people use more land, more and more animals are 6 their homes and many die. WWF can buy important areas to 7 the land from disappearing because of human development.
WWF has completed many projects. In China, WWF works to save pandas from extinction(灭绝). 8South America，it works to save the Amazon Rainforest. Volunteers and donations help WWF complete its work. WWF's work is 9to our environment, and is also important for people to help them 10 time and money.

1. 1.
   1. A.
      in
   2. B.
      at
   3. C.
      on
   4. D.
      ／
2. 2.
   1. A.
      save
   2. B.
      to save
   3. C.
      saving
   4. D.
      saved
3. 3.
   1. A.
      and
   2. B.
      but
   3. C.
      or
   4. D.
      so
4. 4.
   1. A.
      harmed
   2. B.
      harmless
   3. C.
      harm
   4. D.
      harmful
5. 5.
   1. A.
      because
   2. B.
      because of
   3. C.
      so
   4. D.
      but
6. 6.
   1. A.
      lose
   2. B.
      losing
   3. C.
      lost
   4. D.
      loses
7. 7.
   1. A.
      give
   2. B.
      provide
   3. C.
      prevent
   4. D.
      protect
8. 8.
   1. A.
      At
   2. B.
      On
   3. C.
      In
   4. D.
      To
9. 9.
   1. A.
      hard
   2. B.
      important
   3. C.
      easy
   4. D.
      useful
10. 10.
    1. A.
       on
    2. B.
       about
    3. C.
       at
    4. D.
       with