Solar energy is a long lasting source             energy ,and it can           almost anywhere .To generate solar        , we only need solar cells and         ! Solar cells can easily be installed on house           , so we don't need any new space .Compared to other renewable source ,they also posess many advantages : wind and water power rely on turbines which        noisy ,expensive and which take up large space . Solar cells are totally silent and              . As they have no moving parts , they require little maintenance and have           long lifetime     ; 1.A .of  B.in C. for D. at 
2 A. be used    B. is  used     C. be using    D . to be used 
3. A. system     B energy       C . the sun     D. the wind 
4. A . the earth B . the planet    C . the sun    D. the moon 
5, A . yards       B. roofs       C. gardens    D. doors 
6. A .is       B. be         C. are     D. was 
7. A. polluted    B.polluting       C. non - polluted      D . non- polluting 
8. A . some      B .the            C. an       D. a