—I drove to Zhuhai for the air show last week..
—Is that ________ you had a few days off ?
A.where B.when C.what D.why
What is even more important is______ the earth cooled down, water began to appear on its surface.
A.that B.that as C.which D.which as
His idea was such a good one ______ we all agreed to use it.
A.as B.that C.so D.but
Although the causes of cancer_____, we do not yet have any practical way to prevent it.
A.are being uncovered B.have been uncovering
C.are uncovering D.have uncovered
With just four years _______, the Brazil Olympic organizers have promised to deliver an equally inspirational ceremony.
A.gone B.to go C.going D.go
We are so sorry for that.We'll try to determine exactly _________ went wrong that evening.
A.where B.what C.which D.how