22. Trees  are  cut  down  and  used  to  make  paper  and  some  wood  –………..products.

A. relate                       B. relating                    C. related                     D. relates

23.   We don’t want to leave the rubbish …………. because it is not good for the environment.

A. behind                    B. below                      B. beneath                    D. before

24. They learn ………….. to help save wild animals in the local research centre.

A. which                     B. where                      C. how                         D. who

25.  One thing every citizen should do is to ………… littering on the beach or the street.

A. increase

B. punish

C. promise

D. avoid