(C)21.In ________ word “Russian”£¬we can see ________ “r”£®

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

(B)22.—Hey£¬Chen Hui.What do you usually do ________ rainy days?

—I usually read books.

A£®in  B£®on  C£®at  D£®to

(D)23.—Helen£¬is Bill your pen friend?

—Yes.I often write to ________.

A£®it  B£®them  C£®you  D£®him

(C)24.It's too ________.Put on your coat£¬please.

A£®hot  B£®cool  C£®cold  D£®warm