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。
(1)Science is one of my favorite s . How about you?
(2)Could you give us some a on how to learn English well? -I'd be glad to.
(3)Doctors w us to wash our hands before meals to keep diseases away.
(4)The more we get together, the (快乐) we will be.
(5)So far, we've (成功) in saving thousands of people in danger.
