A man cannot smile like a child,________ a child smiles with his eyes,while a man smiles with his lips alone.
______ with so many challenges, Yang Guang, a blind young fellow, didn’t give up; he made great efforts to win success.
— Why do you look so worried? —My computer broke down and my essay ______ unfinished since.
By no means ______ true that all English people know their own language well.
Was it in 1969 ________ the American astronaut succeeded ________ landing on the moon?
It was not until she collected enough material to create her new novel.