Did you arrive here this morning?—Yes,it was at nine o’clock we came here.

What will happen _______ people if they don’t protect the environment?[ ]

_____is this blue sweater?—It’s 36 dollars.[ ]

The books are so nice. Which one can I take?—Oh, you can take __________ of them. I’ll keep none.

______milk do you need to buy?－Two cartons.