-- Lily, is this ___ ipad?    --No, it's not mine. I think it's Lucy's.

I think _______ our duty to keep our environment clean and tidy.

 ---Which would you like better, tea or orange ? ---____. I prefer coffee _____ cream.

The teacher asked the boy many questions, but he only answered ______ of them.

—What else do you want for the dinner?—       else. I don’t think I can eat more.