To make the river clean,rubbish must _____(not throw)into it any more.

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To make the river clean,rubbish must _____(not throw)into it any more.

To make the river clean,rubbish must _____(not throw)into it any more.
To make the river clean,rubbish must _____(not throw)into it any more.

To make the river clean,rubbish must _____(not throw)into it any more.
To make the river clean,rubbish must not be thrown into it any more.

be thrown

not be thrown