问题
填空题
按要求写数字。
1. eight, ten, _________, fourteen, sixteen, _________, _________
2. nineteen, seventeen, _________, _________, eleven, _________
3. sixteen － eight = _________
4. six + nine = _________
5. eight + six = _________
6. 
_________ circles
7. 
_________ trees
答案
1. twelve, eighteen, twenty 2. fifteen, thirteen, nine 3. eight 4. fifteen 5. fourteen 6. eighteen 7. sixteen