a. 粗心的, 不关心的, 无忧无虑的

• 形容词careful 与careless的搭配与用法
  
  形容词careful 与careless的搭配与用法
  
  一、careful 的搭配与用法
  1. 后接介词 of 或 about, 表示“当心”“留意”等。如：
  Be careful of the dog; it sometimes bites people. 当心那条狗，它有时候咬人。
  You must be careful of [about] your pronunciation. 你要注意你的发音。
  be careful 后一般不接介词 for。如：
  我希望你要多注意身体。
  正：I hope you’ll be more careful of [about] your health.
  误：I hope you’ll be more careful for your health.
  2. 表示做某事时要小心或仔细，其后通常接 in doing sth。如：
  Be careful incrossing the street. 过马路时小心。
  You cannot be too carefulin driving

care/careful/careless/carefree/caution/cautious/precaution
记忆：
1. care n. 注意, 忧虑, 由...转交 vt.在意 I don’t care whether you will come or not. 我不在乎你来不来。 care for关心 care about担心 take care of照顾
2. careful adj. 小心的 We are warned to be careful of the rats. 我们被告知要当心老鼠。 be careful of 当心 be careful in doing小心作某事 be careful that + clause be careful (not) to do sth
3. careless adj. 不小心的，马虎的 Being careless, he broke the glass vase on the table. 由于粗心，他打碎了桌上的花瓶。
4. carefree adj. 无忧无虑的 The carefree age has gone for ever. 无忧无虑的岁月已经一去不返了。
5. caution n.小心, 谨慎, 警告 vt.警告 You must do the experiment with great caution. 作实验时必须小心翼翼。
6. cautious Careful forethought to avoid danger or harm. adj. 谨慎的, 小心的 We should be cautious of the plan. 制定计划时要谨慎。
7. precaution n. 预防, 警惕, 防范 I think everything will go well since we have done enough precautions. 我想既然我们已经采取了充分的防范措施，一切会很顺利的。
8. care for v.关怀, 照顾 The teacher is supposed to care for every one of his students. 老师应该照顾好他的每一位学生。
9. care about v .担心 He was excited when he learned that she cared about him.当他知道她担心他时很激动。
10. take care of 照顾 Who takes care of you when your parents are out? 你父母外出时谁照顾你？
另类阅读：
We must take care of ourselves. No one else there cares about us. They don’t care whether we are careful or careless, for they don’t care for us at all!