We must keep the manager(inform)___________of the advertisin

We must keep the manager(inform)___________of the advertisin we must keep the ( )on the road we must keep the( ) on the road we must keep the balance of ( ).(自然界) we must keep( ) in the hospital We must ___(keep) the classroom clean. We must keep the window______(open). we must keep quiet at the library we must keep the reading room quiet please keep your words as we need to inform them with the ou 改错：We must keep the classroom cleaning erery day. We must keep quiet and walk___out of the room A.