We must know what we should do and what we should avoid _______ a good impression on others in public places.

The clever boy made a hole in the wall, _______ he could see _____ was going on inside house.

31 —How long_________each other before they_________married?—For about a year

Lucy likes drawing, ______ she doesn’t like reading.

She always loses her way when she is out by herself because she has no 　　　 of direction.