根据下列句子的意思及所给单词的首字母或汉语提示，写出各单词的正确形式。每空限填一词。(10分)
Science is one of my favorite s___________. How about you?
Could you give us some a___________ on how to learn English well? -I'd be glad to.
Doctors w________ us to wash our hands before meals to keep diseases away.
The more we get together, the ___________ (快乐) we will be.
So far, we've ______________ (成功) in saving thousands of people in danger.