已知随机事件A发生的频率是0.02，事件A出现了10次，那么可能共进行了____次试验．

找出属于不同类的单词。

完形填空。
    Hello. I'm Jenny. I have a best friend.   1 name is Amy. We are in the same school. We both can sing and dance well. She is as  2 as me.
    At school, my teachers all can make 3   happy. But we must4  white blouse with the long sleeves. I am good 5   maths and English. She 6  English. She thinks it's difficult. Yesterday we7   a party at school. We enjoyed ourselves.
    At spare time, my favourite8   is winter. I like 9  snowmen in winter. But she likes eating ice creams in summer. What a pity!
    In two months' time, we are going to go to middle school. We are very busy every day. We  10   harder than now.

在测定金属丝的直径时，螺旋测微器的度数如图所示．可知该金属丝的直径d=____mm．

下列最能说明“资本来到人间，从头到脚，每个毛孔都滴着血和肮脏的东西”是（    ）