13.Busy _______ she is, Rita ______ two hours every Sunday afternoon to spend with her son.
The professor can hardly find sufficient grounds his argument in favor of the theory.
—Sorry,my dog frightened your daughter. —Forget it!________.
The teacher stressed again that the students should not________any important details while retelling the story.
I will put the book________you placed it and make a mark at the place________I put it.
—Shall we have our picnic tomorrow? —________ it doesn’t rain.