21. The Wilsons live in ______ A-shaped house near the coast. It is ______ 17th century cottage.
A. the; / B. an; the C. /; the D. an; a
22. ---Which of the two dictionaries will you buy?
---I will buy ______, for I’ve got some such dictionaries.
A. both B. either C. neither D. no one
23. -----How do you study English so well?
-----________ reading lots of book.
A. To B. Of C. At D. By
