When _______ there, the postman found the door locked and then stopped _______ the letter in the mailbox on the wall.

—The hall      for international conferences is of great importance.—I see, and we are sure to complete it on time.

Mother always tells me to believe in myself, ____ that nothing is too difficult to a willing heart.

The ________look on his face showed that he hadn’t expected it.

— How do you know so much about what’s going on in the countryside?— I’ve got a friend there who keeps me ________.