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(    )21. -What’s this in English?  - It’s ________ eraser.
        A. a                      B. an                   C. the
(    )22. -Do you like salad?  - ________.
        A. Yes, I do                B. Yes, I can             C.  Yes, I am
(    )23. -_________ are these shoes?  -They are $30.