21. . I’ve always wanted a MP5 and I’ve just saved enough money to buy_____.
A. it B.that C. one D. this
22. Paper produced every year is_______the world’s production of vehicles.
A. the three times weight of B. three times the weight of
C. as three times as heavier as D. three times as heavier as
23. I’d appreciate ______ if you would like to teach me how to use the expression once more and I always appreciated _______ me with my English in the past．
A． that; you to help B． this; you helping
C． it; you to help D． it; your helping
