1 are features that are added to something in order to make it look smarter.
答案:Decorations
2If you something,you make it go from your mouth down into your stomach.
答案:swallow
3An is the rectangular(矩形的) paper cover in which you put a letter and you send it to someone through the post.
答案:envelope
4You use the word “ ” to mean you are not joking and you really mean what you say.
答案:seriously
5A is a small,thin,rubber bag which you blow air into so that it becomes larger and rounder or longer.
答案:balloon
