21．Is also awards me ．opportunity to learn American culture at first hand
A．/; the B．the; a C．an; / D．/; a
22．Some inventions are well received, but ．function, they aren’t very successful
A．according to B．in terms of C．regardless of D．owing to
23．The young teacher found it hard to ．his explanation in class most of the time
A．go through B．pull through C．come across D．get across
24．---Oh, it’s so disappointing that our team failed to win the final match!
---Well, don’t worry． ．
A．Take things easy B．Take your time
C．It isn’t the end of the world． D．That’s all right．
