A hard-working man _____ become a great scientist, but a great scientist _____ be a hard-working man.
What________from three to four yesterday afternoon?
—I called you at 6 o’clock yesterday evening,but nobody answered.—I’m sorry.I________my friends download the movie Kung Fu Panda Ⅱ when the telephone rang.A.would helpB.helpedC.was helping
—I saw Mr Smith in the office at ten yesterday morning.—That’s impossible.He________an English party with us then.
________I was in the US,I made a lot of American friends.
—I don’t know________.—Because he has to look after his mother.