(B)21.Look£¡There is ________ island in the middle of ________ lake.

A£®a£»/¡¡¡¡¡¡¡¡¡¡B£®an£»the¡¡¡¡¡¡C£®a£»a¡¡¡¡¡¡¡¡¡¡D£®an£»a

(C)22.—How did you know the song?

—I heard it ________ the radio yesterday evening.

A£®of  B£®for  C£®on  D£®to

(B)23.I'll take two schoolbags.One is for my sister and ________ is for myself.

A£®another  B£®the other  C£®other  D£®the others

(B)24.In this part of the city£¬you can see both ancient and ________ buildings.They show the changes of the city.

A£®strange  B£®modern  C£®beautiful  D£®broken