8.—Our city is short of water,so everybody _______ save water.—Yes,that’s right.We ___________ waste and pollute water.为什么不能用must ,表示必须?而要用should?

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8.—Ourcityisshortofwater,soeverybody_______savewater.—Yes,that’sright.We___________wasteandpollutewa

8.—Our city is short of water,so everybody _______ save water.—Yes,that’s right.We ___________ waste and pollute water.为什么不能用must ,表示必须?而要用should?
8.—Our city is short of water,so everybody _______ save water.—Yes,that’s right.We ____
_______ waste and pollute water.
为什么不能用must ,表示必须?而要用should?

8.—Our city is short of water,so everybody _______ save water.—Yes,that’s right.We ___________ waste and pollute water.为什么不能用must ,表示必须?而要用should?
这并不是强制的,只是一种提倡啊.必须的语气太强硬了.