Mr Obama, who appeared to take the lead in the race inmost battleground states, seemed to______ an air of caution throughout thefirst Presidential debate

My father wants ____ a Beijing Opera artist.

When he was still very young，Ba Jin ________ the reputation he still enjoys today as one of China’s greatest writers.[ ]

Like some of my classmate, I can’t live up to my teachers’ expectations; ______, I let them down

You talk so much about London. You ________have been there. – Yeah, I went sightseeing on a tour last summer.