21.£­________will you finish drawing the picture?

 £­________a minute.

 A. How long; After     B. How soon; After       C. How soon; In  D. How long; For

22.If a blind and deaf person do so much, what about us_____ people?

 A. normal          B. common    C. ordinary  D. usual

23.The new railway winds its way to Hong Kong,______mountains ______ tunnels and ______rivers.

 A.across; over; through              B.over; across; through

 C.over; through; across              D.through; over; across