My sister and I like each other very much although we are very (21)______She’s six years (22) ______ ____me and she works in a bank. I’m still (23)______ school, so I don’t have a job. My sister (24) ____her job, and she earns a lot of money, so she can go out and enjoy herself. She’s very (25)___and often invites me to go with her, but I’m studying very (26) ____ at the moment because I want to pass my exams. I usually say no when she asks me, (27) _______ last night I was tired (28)_______ work so I went with her to a dance. We had a great time! (25)...... .  A.  kind   B. reserved                 C. hard-working D. helpful