Question

读一读，按规律写数字。

1. one, __________, __________, seven, __________
2. fifty-one, __________, seventy-one, eighty-one 
3. twenty, __________, forty __________, sixty __________ __________ 
4. thirty-five, __________, __________, fifty-seven, sixty-eight, __________

Answer 1

1. three, five, nine  2. sixty-one, ninety-one  3. thirty, fifty, seventy, eighty  4. forty-six, seventy-nine