---What can I do for you, Sir?---It is not you waiters but ____ is in charge of the restaurant ___ I want to talk to.
What we need____ good textbooks.
That they were wrong in these matters ____ now clear to us all.
Large quantities of water ____ for irrigation.
Between the two rows of trees ____ the teaching building.
I have finished a large part of the book, the rest of which___ more difficult.