补全对话
从方框中选择最佳选项完成对话, 有两项多余
a. I'm cleaning the house.
b. Is your mother making dumplings with her?
c. What about your father?
d. Yes, we are.
e. She is buying some food in the shop.
f. What's your mother doing?
g. They are making cards for their family and teachers.
Daming: Hi, Tony! Are you getting ready for Spring Festival?
Tony:____
Daming: What are the girls doing?
Tony:____
Daming:Sounds great(听起来很好)! Where is your mother?
Tony:____
Daming: What are you doing?
Tony:____
Daming: How hard you are working! And is your sister helping you?
Tony: No, she isn't. She is shopping with my mother.
Daming:____
Tony: Look! He's painting the door there.
是非零向量且满足
，则
的夹角是 （ ）