—Must we keep the window _______ all the time?—No, you don’t have to.A.opening B.opened C. open
— _______the door, please. —Come in please. The door _______.
Mr. Wang is going to meet Kitty and _____ at the school gate tomorrow morning.
—Let me help you carry the box. —No, thanks. It’s big, __________ there is nothing in it.
We should ________ ‘Thank you’ when we borrow something from someone.
— How many ____________ can you see in the kitchen? —Three.