英语语法中数词为什么在1、In February,there are only ( )days.填twenty-nine

填数词：There are () days in a year sometimes there are twenty-eight days in A May B February C There are usually[ ] days in February There are （ ） days or （ ） days in a year.填数词 there are days in February in each leap There are 28 days in ________.A.January B.February there are _ days in february ,somtimes there are _ days. There are （ ）days in a year用数词填空 There are ( )days in a week.用数词填空 There are （ ）days in January.用数词填空 在括号里填数词there are ( )hours in a day There are only twenty _eight or twenty_nine day in F____