I was on my way home with a friend yesterday ____ I found a mobile phone by the roadside. After picking it up, I suggested that we go to the house in front of which we found the mobile phone. And we did so. I ____ (knock) at the door and two young men answered. Neither of them had lost ____(they) phones, but as I referred to some names on the contact list(通讯录), one of them said he also had those ____(name) and that it must be the phone of one____their friends. Then, he took the phone and said how wonderful it was that I took the time____(find) the owner. Afterwards, I left without ____(leave) my name or address. I never considered keeping the phone. Instead, I immediately tried to find ____ owner. And I believed that was ____(exact) what I would want someone to do if I lost my phone. It couldn't have been ____ (good).

    Sometimes, helping others is just doing the right thing.

求下面图形的面积．

____ $d{m}^2$

北京奥运会上运用高科技手段检测兴奋剂．“乙基雌烯醇”（C₂₀H₃₂O）是兴奋剂中的一种，下列关于该兴奋剂的说法中正确的是（　　）