Write the missing numbers: 1 one, 2 two, 3 ___, 4 four, 5 five, 6 ___, 7 seven, 8 eight, 9 ___, 10 ___; 11 eleven, 12 ___, 13 thirteen, 14 fourteen, 15 ___, 16 sixteen, 17 ___, 18 eighteen, 19 nineteen, 20 ___; 21 twenty-one, 22 ___, 30 ___, 40 ___, 50 fifty, 60 ___, 70 seventy, 80 eighty, 90 ___, 100 one hundred.