______ is known to us all , the old scientist,______ life was hard in the past, still works hard in his eighties.
He must have attended the meeting yesterday,___________ he?
I was really too busy with my homework and I couldn't help ____________ housework.
Mary is one of the brightest students who_________ from New York University.
Mr. Alcott, headmaster of the school, refused to accept made by the Students’ Union.
Mary is short__________ her brother is very tall.