After he won all the money they treated him ______a king.

   Is this the piano _______ your familoy for over eighty years?

   ______they have been working hard to find?

   The key you have just got ____ the front door.

   There is a saying which ____like this: “ Still waters run ______.”

  The animal of this kind is _______; we’d better ________.

   Driving the halfway I _____ my car was out of gas.

  The policemen are searching for the ____car on the highway.

   In the last ten years she _____ like this; she is killing her health.

A. works  b. has been working   C. worked     D. is working

   – Have they found out the _____ of the fire?

--  Yes. It was a cigarette end that _____ the fire.