A.We shouldn’t litter. | B.We shouldn’t kill wild animals. | C.It’s 50 yuan. |
A.plant | B.plants | C.planting |
A.should | B.shouldn’t | C.can |
A.should; should | B.should; shouldn’t | C.shouldn’t; shouldn’t |
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 |