Give the correct form of the word given to complete the sentences

Give the correct form of the word given to complete the sentences
1.Tidal energy is renewable ,and .... and clean ( plenty)
2.Wind will be used as an .... friendly sources of energy ( environment)
3. There are many ways will be used to solve the problem of...(pollute)
4.Solar power can be used to...or cool our houses(hot)
5. ...,fossil fuels are harmful to the environment ( fortunate)
6.We should use them ... and try tofind out alternative sources of power (economy)
7.Solar energy is ....,plentiful and clean (renew)
8.I think that solar energy can be an...sources of energy in the near future (alter)
9.We should reduce the use of...at home (electrical)
10.It's a clean sources of energy .Sailboats couldn't move without this ...(powerful)
11.Waves will be used as an .... friendly sources of energy (environment)