完成下列同义句变化。

1. The film started fifteen minutes ago. The film has _______ for fifteen minutes.

2. To protect the environment is our duty. ____ is our duty ________ the environment.

3. I don't want to go to work. I'd rather stay at home. I'd rather stay at home ______ going to work.

4. With the help of the teacher, I found my lost watch. _______ the teacher, I found my lost watch.

5. Susan has been in this city for more than ten years. _____ more than ten years _______

   Susan ________ to this city.

患者，女，28岁，4d前行剖宫产手术，术后出现头痛，伴恶心呕吐，立位时明显，卧位时减轻，头MRI未见异常。

考虑诊断为

A．典型偏头痛

B．丛集性头痛

C．低颅压性头痛

D．脑炎

E．静脉窦血栓