If we don’t study hard, we will___________ in our class.
---Daddy, shall we go swimming now?---Sorry. It’s not the right __________. I’m too tired.
---The books are so nice. Which one can I take?---Oh, you can take __________ of them. I’ll keep none.
---We are flying to France on vacation. We will arrive _________ Paris _________ the morning of May 20th.---Have a good time.
You’d better stay at home. It’s raining_________ .
People should _________ down trees in order to protect the environment.