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. _________ trees1. twelve,eighteen, twenty 2.fifteen,thirteen,nine 3. eight 4. fifteen 5. fourteen 6.eighteen 7.sixteen