The students in Class Two always exercise a lot. ______ homework, they finish it very quickly.[ ]

Where is Tom? His mother is waiting for __________ outside.

Because of the terrible earthquake, some people became homeless and they had to ________the tents for the night.

________ people used the computer thirty years ago, but now it’s very popular.

Yesterday I lost my pencil sharpener. I couldn’t find_______.—Oh, it’s a pity. You’d better buy ________ this afternoon.