Our teachers ask us ( ) (not litter) on the ground.We should ( )(keep) our classroom clean.

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Our teachers ask us ( ) (not litter) on the ground.We should ( )(keep) our classroom clean.

Our teachers ask us ( ) (not litter) on the ground.We should ( )(keep) our classroom clean.
Our teachers ask us ( ) (not litter) on the ground.We should ( )(keep) our classroom clean.

Our teachers ask us ( ) (not litter) on the ground.We should ( )(keep) our classroom clean.
not to litter
keep
ask sb.no to do sth.叫某人别做某事
should do sth.应该做某事

Our teachers ask us (not to litter ) (not litter) on the ground.We should (keep )(keep) our classroom clean.

not to litter ...keep