IV. Give the correct forms of the words
15. _______________________________________ car can fly very fast and it doesn’t need a drive. (drive)
16. The water in this area is terribly ____________________________________. (pollute)
17. Solar energy is __________________________________ and it can be replaced easily. (plenty)
18. Vietnam still relies mostly on non – renewable energy sources; however, hydro power is ______________________ used here, too. (increase)
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