It’s a good habit to turn off the unnecessary lights, it can help save .
— David, your mother’s birthday is _____. Let’s think about how to celebrate it.—OK, Dad.
My school is close ____a supermarket.
I don’t like those big cities which have got ____ people and ____ traffic.
Now, everybody, please turn to page _________and look at the ___picture.
_______ Tim’s help, I found my pet dog in the end. I should say thanks to him.