Which is ________ , the sun or the earth?
David scored a wonderful goal _____the football match and the team won the match ______.
—Shall we go to the Great Wall on National Day?—It’s a great idea ,__________we don’t have enough money.
The chair is made_____wood and the paper is made _____wood,too
Why not___ your teacher for help when you can’t finish ___ it by yourself?
When I walk_____ the classroom, all the students are listening carefully.