a. 惯常的, 习惯了的

◆记忆方法一：
联想方式：ac AC米兰，custom习惯
记忆方法：AC米兰队员的习惯是通常的，习俗的。

exercise/drill/practice/routine/custom/accustomed/customs/costumer/habit
记忆：
1. exercise [ 5eksEsaiz ] n.练习, 习题, 锻炼, 演习 n. 训练, 锻炼 vt. 行使 In order to obtain the skill, we need plenty of exercises.要学到技能，我们需要大量的练习。
2. drill [ dril ] n. 钻子, 军事训练, 操练, (反复)练习 v. 训练, 钻孔 Can you drill the drill with another drill?你用另一把钻子钻这把钻子吗？
3. practice [ 5prAktis ] n. 实践, 惯例, 练习, 实习 As is often said, practice makes perfect. 正如大家经常说的那样，熟能生巧。
4. routine [ ru:5ti:n ] n. 例行公事, 常规, 日常事务 Don’t be annoyed. It’s nothing but routine. 别生气，这只是例行公事。
5. custom [ 5kQstEm ] n. 习惯, 风俗 Follow the custom of the local people.入乡随俗。
6. accustomed [E5kQstEmd] (to) adj. 习惯于 We are not accustomed to the weather there.我们不习惯这里的天气。
7. customs n. 海关 The officers in the customs will check there is nothing against law in your package.海关官员会检查很行李中是否有违法的东西。
8. costumer [`kCstjU:mE(r), kC`stjU:-] cost, 花钱， costumer, 花钱的人，n. 顾客 Few costumers go there a second time. 很少有顾客再次到那儿去。
9. habit [ 5hAbit ] n.习惯, 习性 How can I get out the habit of making some sounds while reading? 我怎样才能摆脱看书时发出声音的习惯？格言：Old habits die hard.积习难改。
10. hobby [ 5hCbi ] n. 业余爱好 No hobby, no joy.没有爱好就没有快乐。
另类阅读：
Doing exercises is our practice in school. Sometimes we take part in military drills. Sometimes we go to the village whose customs can help us get rid of some bad habits.

轻松一刻：
Passer-by: Why do you beg?
Beggar: Because I need money to buy wine.
Passer-by: Then why do you drink?
Beggar: Because drink gives me courage to beg.