The train is to start soon and Mary hasn’t turned up. What _____ have happened to her?
All cases ______ children are dealt with in a special children’s court.
Some students, hoping to get a high score, are _______ about the results of coming exam.
As we all know, _______ mankind has realized the walk in ______ space.
-----I’m afraid I can’t finish the novel you lent me this week.----___________.
_______ the manager came to Beijing on business, he would visit his old friends there.