How time flies! ________ almost ten years since my friend left China to work in the USA.
A. It’s               B. It was              C. That’s             D. That was

— When did Mr Green teach in China?
— _______.

— The floor is clean and dry now. Who _______?
— Sorry, I don’t know.

— Have you _______ read this story before?
— Yes. I’ve _______ read it.

--- Where is your mother?
--- She has ______ to Sichuan on business. She has ______ there four times recently.

It ____ over 10 years since my grandpa _______.

-----Did you notice him come in?
-----No. I _____ a football game.

--Surfing first started on the islands of Hawaii, didn't it?
--Yes, but now it ______ by people all over the world.

If you ________ a chance to study in a foreign country, just take it.

-- ________ you _______ the football match yesterday?
--Yes, I did. lt was great.