21. It is ___ honor for anyone to be elected ____ manager of such an important department.

   A. / ; a             B. / ; /             C. a ; a           D. an ; /

22. --- I bet someone stole my backpack.

   --- Well, you _____ have kept an eye on it.

   A. may             B. can             C. would        D. should

23. The first time Johnson went to Spain, he managed to make himself ____ with his ____ Spanish.

A. understand; broken                   B. understood; break  

C. understood; broken                  D. understand; break