Great changes ______ in the city and a lot of buildings ______.

--- Where is your uncle?
--- He ______ to London. He ______ for over three months.

--- How long have they ______ France?  --- For about half a year.

---How often ___________ the Olympics _____________?
---Every four years.

--- When did you get to know the information?
--- ____  I ____ yesterday.

—How many times _____ he _____ NanChong?  —Twice.     
A. has, gone to     B. has, bee to       C. has ,been in

I have been ______ English _______ ten years.
A. study; for      B. studying; since      C. studying ; for   

He _____ when the UFO arrived.         
A. was sleeping   B. were sleeping       C. has slept

There _______a football match in this school next week.
A. will have     B. is going to have     C. will be

His father _____ to Nanjing. He _____ back next week.
A.     has been, is   B has been, will be　C. has gone, is  D. has gone, will be