The number of the stamps _____ limited, so a number of people _____ to have a look at them.
---- I drove to Zhuhai for the air show last week. ---- Is that ______ you had a few days off ?
I still remember ______ this used to be a quiet village.
It is widely ______that smoking can cause cancer.
____appeared to me that he enjoyed the food very much.
____all the inventions have in common is ____they have succeeded.