读课文《胖乎乎的小手》，把句子补充完整，并回答问题。

①我有一双____的小手，我的小手会____、____、____。

②我会画画，我的小手还会____。

Mother：Sally, can you help me, please? I want to go shopping.

Sally : OK. Mum. What do you want to buy?

Mum : Some eggs, some oranges, some milk, and some chicken for supper. What can we have for lunch tomorrow?

Sally : I don't know.

Mother : Oh ,yes, it is. Some fish.

Sally : Is fish very expensive ( 昂贵的）?

Mother: Yes , it is. But dad likes fish.

Sally : What about some rice?

Mother : I want some nice bread.

Sally : OK. Let' s go.

I ____ a girl. I ____ eight.

如图，正方体ABCD﹣A₁B₁C₁D₁中，E为AB中点，F为正方形BCC₁B₁的中心．

（1）求直线EF与平面ABCD所成角的正切值；

（2）求异面直线A₁C与EF所成角的余弦值．