everybody must do everything he can——waste water from running into rivers.

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• we must do everything we can （ ） waste water from running into the rivers.A.keep B.kept C.to keep D.keeping要说明理由，
• everybody must do everything he can——waste water from running into rivers.A.keep B.kept C.to keep D.keeping（为什么）2.It ____be him.为什么是can't不是mustn't3.since june 1st last year,all the supermarkets have___free plastic bags.为什么是stopped providing而不是to stop providing
• everybody must do everything he can——waste water from running into rivers.
• the people must do everything they can－－ -waste water from running into riversA keep B kept C to keep D keeping怎么回答,
• the people must do everything they can－－ -waste water from running into rivers
• we must do everything we can （ ） waste water from running into the rivers.
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