In the past few years, sea ice ____ in the Arctic as a result of global warming.

By the time our teacher arrives tomorrow, all the work _____,with which he will be content.

---- I ’m sure Andrew will win the first prize in the final.   
---- I think so. He     for it for months.   

Before joining the Department of Defense, Mr． Panetta _______ as director of the CIA from February 2009 to June 2011．

By the end of this year, a new library ________ in our school.
A would be completed                                           B will have been completed
C had been completed                                             D was being completed

He said that he _______ to Shanghai the next day.
A would go            B went             C had gone           D would have gone

The timetable says the school bus _________ here for the first trip at 6:30 am.

—Where is your brother?   
—He has gone to Beijing. He         back in three days.

—I am going to America.
—how  long      you     there?

The geography teacher told his student that the earth ________around the sun .