28.We must keep the manager(inform)__________of the advertis

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 __________of this month,we will finish planting all the tree please keep your words as we need to inform them with the ou 改错：We must keep the classroom cleaning erery day.