We must stop the pollution to our beaches.为什么 用to

We must stop the pollution____(live)a happy life. The traffic light is red now.we must stop Nowadays,the earth is p_______s_____.Our earth is in d_______.We must p_______the earth.We must keep the earth c_____.We must stop p_______the earth.We must ___________________ We must stop the boys from playing foootball in the street.We must _______the boys _____ _____foootball in the street. we must stop using the waste books 同义句改为 we must 两个空格 using the waste books We must stop and look both ways b___ we cross the road. We must do something( )(stop) the ( )(chemistry) factory from( )(pour) the waste water( )(介词) the we must stop ------(talk)when class begin we must stop-_____(pollute) our earth must doing him we like stop this The tyaffic light is yellow now .we must--------A.wait B.go C.stop We must stop the pollution to our beaches.为什么 用to We must stop people from ___(throw)rubbish into the river We must to something to stop the serious nuclear radiation from japan改为被动语态 we must stop -------(cut)down the trees.cut是不是用原形 We must take actions to stop factories ____ ____ ___ the farmla We must stop polluting the water.(划线部分提问)__must we stop____?划线部分是polluting the waterWe must stop polluting the water.(划线部分提问)____must we stop____?划线部分是polluting the water before we cross the road ,we must stop and look both ways .改为同义句怎么改?