I simply couldn’t understand how it _____ that you did so much work within such a short time.
His letter was especially welcome as I ____ from him for long.
—May I speak to your manager Mr.Williams at five o’clock tonight? —I’m sorry. Mr. Williams ________ to a conference long before then.
We_______onitforseveralhoursbutwehavenotyetreachedanyconclusion.
I ____ to go for a walk, but someone called and I couldn’t get away.
Salley________Beijing for Shanghai and________there ever since. You can go and pay her a visit on your way to Hangzhou.