—When does your plane take off?—At 3:00 p.m. tomorrow. I’ve just called the airport to ________ it.
David had prepared carefully for the chemistry exam, as he wanted to be sure of passing it at the first _____.
---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.