12.The price ________,but I doubt whether it will remain so.

12.The price ___C_____,but I doubt whether it will remain so.
A.went down B.will go down
C.has gone down D.was going down
13.—How long _____A___ each other before they ________ married?
—For about a year.
A.have they known; get
B.did they know; get
C.do they know; are going to get
D.had they known; got
14.You can’t move in right now.The house __C______.
A.has painted B.is painted
C.is being painted D.is painting
15.—Hey,look where you are going!
—Oh,I’m terribly sorry.___C_____.
A.I’m not noticing B.I wasn’t noticing
C.I haven’t noticed D.I don’t notice
16.The reporter said that the UFO __A______ east to west when he saw it.
A.was traveling B.traveled
C.had been traveling D.was to travel
17.—Is this raincoat yours?
—No,mine ____A____ there behind the door.
A.is hanging B.has hang C.hangs D.hang
18.I turned around and saw everybody __A______ at a man who ________ loudly in a foreign language.
A.was staring; was shouting B.was staring; shouting
C.staring; shouting D.stared; shouted
19.Henry remained silent for a moment.He ___C_____.
A.thought B.had thought
C.was thinking D.was thought
20.We would like to go and thank him ourselves,but we __A______ out his address yet,
A.haven’t found B.hadn’t found
C.didn’t find D.don’t find