We have been looking at houses, but haven’t found _____ we like yet.

There were only two paintings for sale and he bought ____.

They told us that these small apples are often sweeter than big ____.

______ can make my mother change her mind. She is such a person who never gives up easily.

(2013·山东济宁模拟)When you are done with the book, go out for a walk or ________.