题目内容：

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I've had plenty of friends throughout my life, but I always felt like I was missing that one big friendship that so many other women seemed to have. As an only child, I had always longed for a sister. As an adult, all I wanted was a true best friend to fill that vacancy.

When I was thirty-two, I was living my dream as a stay-at-home mom and then my world came crashing down. On a Tuesday afternoon in May of 2018 I was diagnosed with a stage-two cancer. My days of dates, trips to the zoo, and lazy mornings at home with my twenty-one-month-old son turned into appointments with doctors, terrifying body scans and a whole lot of uncertainty.

Over the course of eight months I got cycles of treatment. While the pain and side effects were almost unbearable, the fear and anxiety that developed were even worse. My husband and parents were an amazing support system. However, I still felt depressed because it was impossible for them to figure out what I was going through both physically and emotionally. But I couldn't expect them to. Plus, I wanted to be strong for them so that they could in turn be strong for my son. I never missed having a sister more than I did during that time.

Eventually I found myself wishing for a "cancer friend" so that I could relate to someone who knew what I was going through. I would sit in the ward and look around the room, trying to find someone to befriend. I met some wonderful people, but somehow I never connected with them. Later, I continued to try to find a "cancer friend"; but in vain. So gradually I became despondent about the potential for finding such a friend.

Unexpectedly, I found what I needed in the most unlikely places. In my son's preschool, I met with a young mum called Leah, who also had a cancer. We had much in common and became the closest friends. We sometimes compared our situation to having been to war. We went to battle for our lives and found it became easier for us to do it together.

1.What caused the author' s world to crash down? (No more than 10 words)

2.Why was the author still depressed though she had family members' support? (No more than 10 words)

3.What does the underlined part in Paragraph 4 mean? (No more than 5 words)

4.What did the author and Leah gain from their friendship? (No more than 15 words)

5.What do you learn from the author' s story? (No more than 20 words)