1．Color blind people often find it difficult to________between blue and green.
A．separate B．distinguish
C．compare D．contrast
2．Our new house is very________for me as I can get to the office in five minutes.
A．adaptable B．comfortable
C．convenient D．available
3．Come and see me whenever________.
A．you are convenient
B．you will be convenient
C．it is convenient to you
D．it will be convenient to you
