21.Medical assistants not only have to do some office work, but have medical______ as well.
A. responsibilities B. experiences C. opportunities D. performances
22.Life is filled with challenges. As we get older, we______ realize that those challenges are the very things.
A. seem to B. come to C. wish to D. try to
23.To my disappointment, my parents didn’t _______ up at the appointed hour.
A. wake B. make C. turn D. build
