The headmaster has promised us that we shall be told ________ the results of the exam come out.
.–Finished the novel? How do you find it?–_______ It’s worth reading a second time.
.–How did you know the surprising news?–I happened ______ the event then.
.The house caught ______ fire while they were away. It must have been set ______ on fire by someone.
._______ the argument sounds reasonable, it still needs support of evidence.
..Modern China is experiencing a completely new period ______ respect for science and creativity has become the guiding principle of the society.