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21.---Mr Black, this is our language lab. Would you like to go in and have a look?
---OK. ________.
A. Help yourself B. This way, please C. Follow me D. After you
22.I admit I made a lot of mistakes in the work, and I will responsibility for them.
A. assume B. decline C. accept D. secure
23. The woman, who is said to have moved to America last year, ____ in China for almost twenty years.
A. lived B. has lived C. was living D. had lived
