缩写：
1.Sun.
2.Mon.
3.Tues.
4.Wed.
5.Thurs.
6.Fri.
7.Sat.
填空：
1.There are seven days in a week.
2.Sunday is the first day in a week.
3.Saturday is the last day in a week.
（PS：缩写里答案后面的“.”是缩写形式后的必带物,在答题时需要一起写上去~)