A.should | B.shouldn’t | C.can |
A.keep the rivers clean | B.shouldn’t waste water | C.shouldn’t litter |
A.We shouldn’t plant more trees. | B.We are happy. | C.We should plant more trees. |
A.should | B.shouldn’t | C.doesn’t |
A.waste | B.wasted | C.wasting |
A.use | B.drink | C.waste |
A.enough | B.many | C.much |