将下列句子改成感叹句.
1.Itisfinedaytoday.
___________________________dayitistoday!
2.Theyarehavingawonderfultime.
_______________________________________theyarehaving!
3.Yourgardenisbeautiful.
________________yourgardenis!
4.Theproblemisdifficult.
_________________theproblemis!
5.Theundergroundtrainisfast.
___________________theundergroundtrainis!