用括号内所给单词的适当形式填空。
小题1:This _________(feel) makes him upset all day and night.
小题2:Mother lets Michael ___________ (not watch) TV all day because the final exam is coming.
小题3:He has a lot of trouble ___________ (work) out the problems.
小题4:I love the opera, Cats. It’s so _________ (fun).
小题5:Mrs. Green seems            (worry) because his son is ill.