21.—I don’t feel like going out. Why don’t we just stay home and watch TV instead?
— ______ You promised to take me out for dinner and to the theatre on my birthday.
A. Great! B. Why me! C. Come on! D. Not at all!
22. There is hardly an environment on earth ______ some species of animal or other have not
adapted successfully.
A. to which B. in which C. for which D. on which
