A new laptop costs about _____ of a second-hand one.
-Must I do well in all the subjects, Mum? -Sure, baby ! As an old saying goes, knowledge is __________.
-When did the Great Wall __________? -In the Qin Dynasty.
That was the first time Helen __________ the meaning of love.
-I'm going to London next Monday. -What a __________! So am I.
We have come to __________ conclusion that the company has been making __________ great progress these months.