In much of the animal world, night is the time ____ for sleep —pure and simple.
A．set aside B．set down C．set off D．set up
Laura was away in Paris for over a week . When she got home，there was a pile of mail_____for her.
A．waited B．waiting C．to wait D．was waiting
—What major will you choose when you are at university?
—______ but Physics, which has brought terrible dreams to me for the past 12 years.
A．Nothing B．Anything C．Something D．Everything
It is said that the engines of Flight MH370____while flying over the Indian Ocean,with all on board killed .
A. broke out B. ran out C. gave out D. wore out
—People often don't appreciate what they have, do they?
—No, _____ they lose it.
A. if B. afterC. when D. until
—Did Ann fail in English?
—She ____. Don't you notice that she looks depressed?
A.might B．must C．may have D．could have
