---May I speak to your manager Mr.Willians at five o'clock tonight?"---"I'm sorry, Mr.Williams _______ to a conference before then."
Mary had to call a taxi because the box was ________ to carry all the way home.
He knows several languages ________ English, French and Japanese.
The money collected should be made good use ________ the people in Sichuan Province who suffered a lot in the earthquake.
________ it is to have a cold drink on such a hot day!
Many of them turned a deaf ear to his advice, ________ they knew it to be valuable.