21（2010·黑龙江省哈九中三模）27．It’s important for us to employ a word or a phrase according to the ______ in language studies．
A．situation B．expression
C．condition D．translation
22（2011·河南省扶沟高中高三第二次考试）Football is _______sport I love, _______ sport that has given me so much．
A．a; the B．/; a C．a; a D．the; the
