today , ............ appliances are especially designed to protect the environment ( electricity )

................. gas is going to run out someday ( nature )

scientists are finding an ............. source to replace gasoline ( limited )

will non-........ energy sources be banned from using in the future? ( renew )

we should think .............. how to protect our environment ( positive )

Unfortunately, biogas is not totally .......... to people ( harm )

Nuclear power is ......... , but it is very dangerous ( plenty )

Disposable batteries are .......... the environment ( pollution )

Sắp xếp

Fossil/ sources/ by/ renewable/ increasingly/ replaced/ energy/ fuels/ are

big/ How/ drive/ ?/ alternative/ machinery/ should/ will/ we/ energy/ use/ much

will/ time/ not/ this/ impact/ of/ testing/ wind/ Susan/ tomorrow/ power/ be/ the

consumption/ as/ needs/ energy/ to/ The/ as/ possible/ reduced/ much/ be

polluting/ environment/ oil/ costs/ its/ of/ , / and/ money/ lot/ waste/ is/ Using/ also/ a/ the 

my cousin ( be ) an environmentalist for three years

many nations ( purchase ) wind power from the UK now

nowadays, non-renewable energy sources ( limit )

the world ( use ) mostly renewalbe energy sources in the future

as planned, more dams ( install ) to produce hydropower next year