— You must keep the door _______ when you leave your room. — But I want to get the fresh air. I think I can keep the window ________ instead.
The math problem is so hard. I really don’t know .
They didn’t come to the meeting ________ the heavy rain.
----- Jack, is there __________ in today’s newspaper? ----- No, nothing.
It is time for class. Let’s stop _______.
---What are you reading? --- The Old Man and the Sea Hemingway.