You should ____ the shower when you are washing your hair.OK, I know we need to save water.

Which of the students_____the examination?

Why didn’t Tom give you one of his paintings? — I didn’t want one, but he would have given me one if I______.

The mobile phone has influenced people’s life a lot since it _________.

You like the Lenovo Computer. Why not buy one?—Well. I can’t afford ________ computer.