1 . English is compulsory for all students, but art and music are ______ (选修的).   (根据汉语提示单词拼写)

2 . I don’t like horror films, because they are too s______. (根据首字母单词拼写)

3 . Many people are ______ (沉迷的) to smoking, which is extremely dangerous to public health.   (根据汉语提示单词拼写)