第二部分 语言知识运用（共计50分）
Ⅱ. Multiple choice (本题共15分，每小题1分)
Choose the best answer from A、B or C according to the meaning of the sentence.
( ) 21. —How many _______ are there in the kitchen?
—Only two.
A. bag of rice B. bags of rice C. bags of rices
( ) 22. He has been here _______ he left his hometown.
A. since B. in C. for
