—Whyhaveyouchangedsomuch?
—Youdon'tknowI______ahardlifeinthelasttenyears.
A、hadThe progress he has made in maths is much greater than ______ in English .
Childrenshould_________wastewater.
The Great Wall in China is one of the few _____ objects on the earth _____ from the moon .
IntheendI______agoodefforttopasstheexamination.
_____ seen ,it will never be forgotten.
