一天晚上，甲去电影院看电影。电影开始放映后，坐在甲后一排的乙、丙二人不停地说笑、打闹。甲按捺不住，起身回头指责二人。三人发生争吵，乙、丙二人对甲大打出手。甲情急中掏出随身携带的水果刀往前乱刺，结果刺中坐在乙旁边的观众丁，致丁重伤。甲的行为属于( )。

A．正当防卫

B．假想防卫

C．防卫过当

D．防卫第三者

根据所给汉语完成下列句子。

1. You'd better put on the sunglasses to ___________ (遮挡阳光).

2. Some leaves ___________ (落到水里) and remained there for some time.

3. Could you please tell me ___________ (这本书我可以借多长时间)?

4. In her spare time, Amy ___________ (用旧电视机做玩具) and sells them to raise

    money for the Children's Hospital.

5. Unless you speak French yourself, it's best to find ___________ (能为你翻译的人).