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—What happened to Tom?
—He ______ his leg while playing football with his classmates.

It ______ that Tokyo will be the host city for the 2020 Summer Olympic Games.

----That must have been a long trip.
-------Yeah, it______ us a whole week to get there.

--- It’s the fourth time that heavy smog(霧霾) has hit the city this month.
--- It’s high time we _______ measures to fight air pollution.

--- Hi Mike, are you busy now?
--- Not really. I _____ my work, and I’m going to see a movie online.

---I’m sorry, but there is no smoking on this flight.
---Oh, I _____that. Sorry, I won’t again.
A. don’t know     B didn’t know    C. won’t know     D. haven’t known

Mr. Black _____ for Shanghai in a few days. Do you know when the earliest plane ____on Sunday?

This is my workmate ,Mr. zhou , but he ________ in New York for 10 years.

---I’m sorry, but there is no smoking on this flight.
---Oh, I _____that. Sorry, I won’t again.

—Have your read the article A Dirty Beijing, which is about air pollution?
—Yes. It’s highly informative. I _____no idea that the PM2.5 there sometimes reached 300.