填空题
1.Our mouth is ________.(红色的)
2.This pencil is ________.(绿色的)
3. yellow+blue=________ 黄色+蓝色=________
4. ________+black=grey ________+黑色=灰色
5.My ball is red.(对画线部分提问)
_______ ________ is your ball?
6.—Is this her book? (根据问句,写出否定答句)
— ________, it isn't.