—Oh, dear! I forgot the air tickets. —You ______ something.
________ made me more unhappy was _________ the boy asked my friend to be his girlfriend and she agreed.
As is known to all,_________ Yang Liwei has become a space hero is _________ we have expected.
Scientists believe Native Americans arrived by crossing the land bridge that connected Siberia and _________ more than 10 000 years ago.
—Will you go to the party?—Of course I will if _______.
You may have your own decision on this matter,and I have little doubt _________ you’ll succeed.