Look, there are so many _______ in the sky. It’s going to rain.
---Could I go boating this weekend, Dad?---Yes, you ________. But you ________ come back before lunch.
--My father has decided to ________ smoking.---That’s good news for us.
_______ the teachers in the school is one hundred, and ________ of them are women teachers.
---Can you tell me whom the book ________ in April, 2012?---Sorry, I don’t know.
My cousin used to ________ online too late, but now she is used to ________ to bed early.