①主动自我介绍 ②积极参加学校、班级组织的活动
③记住同学的名字 ④多与老师交流
A：①②③
B：②④
C：①③
D：③④
You have no idea what I've had to ______ in finding the proper job in the last few months.
以为农民工小伙给一对母子让座，母亲竟嫌弃小伙坐过的座位太脏，还冲着孩子发火不让孩子坐。这启示我们（ ）
— ______. To tell the truth, I've seen it twice.
