11. My team leader suggested _________ a show to raise money for poor people the village.

A. to organize             

B. organizing

C. to be organized

D. organized

12. We will live a happier and healthier life _________ we keep our environment clean.

A. although                

B. unless

C. if

D. however

13. _________ energy can be easily used in tropical countries where there is u lot of sunlight.

A. Nuclear      

B. Fossil fuel

C. Wind

D. Solar