根据下列句子的意思及所给的汉语提示，写出空缺处的词。

1. Because of his ________ (死), his parents were badly ill.

2. This is the ________ (九十九) stamp.

3. I'm sure you can pass the exam ________ (成功).

4. Look! The sick man is very tired, but he is still _________ (练习走) without any help.

5. By the time I arrived there, the film had _________ (开始) for about five minutes.

2，5，10，17，26， ( )

A．29

B．33

C．37

D．41