单项选择题

Most of life is habitual. You do the 1 things you did yesterday, the day before and every day for the last month. Habits, whether good 2 bad, make you who you are. The key is controlling 3 . If you know how to change your habits, 4 even a small effort (努力) can bring about 5 changes.
I"ve been trying 6 years to change many aspects (方面)of my life, 7 changing my eating habit, 8 more exercise, watching less television, giving up smoking, and visiting my parents more 9 . Small changes like 10 can make life better.

A.often
B.quickly
C.carefully