(    )21. London is __________ big city and it’s            capital of the UK.
A. the, the          B. a, a                C. the, a                D. a, the
(    )22.             your sisters afraid of __________ out alone(独自) at night?
        A. Is; going         B. Is; to go            C. Are; going           D. Are; to go
(    )23. Mrs. Zhu teaches __________ English . She is a good teacher of __________.
        A. us; us           B. our; our          C. us; ours              D. our; ours
(    )24. There is __________with her MP5. It doesn't work.
        A. nothing wrong                              B. wrong nothing
        C. something wrong                           D. wrong something