It is by no means clear ________ the president can do to end the strike.(2012·新课标全国)
---I saw Mr. Smith at Xianyang Airport this morning. ---You ____. He’s still on holiday in Hawaii.
_____ much advice I gave her, she did what she wanted to do.
---- How did you know the surprising news? ---- I happened ____ the event then.
----How about the two of us chatting online? ---- ____ . It’s much cheaper than talking on the phone.
This is ____ one-act play set in ____ European country in the 1980’s.