21. My dear fellow students, I wish all ______ best in your future studies.
A. a B. an C. the D. /
22. Yesterday I turned my drawer ______，looking for my pen, a present given by my best friend.
A. upside down B. outside down C. side down D. up down
23. Give him time. It's always hard to ______ a new place.
A. devote to B. stick to C. lead to D. adjust to
