下列关于电路的说法错误的是（　　）

10－3＝____

7－4＝____

13－9＝____

2＋7＝____

5＋5＝____

如图，在△ABC中，CA=CB，∠ACB=90°，AB=2，点D为AB的中点，以点D为圆心作圆心角为90°的扇形DEF，点C恰在弧EF上，则图中阴影部分的面积为____ ．

补全对话

A:Hello, may I speak to Kate, please?

B:Speaking.

A:Hello, Kate! This is Lily speaking. It's Sunday tomorrow. ____

B:Nothing much. Do you have any ideas?

A:The spring has come. I hear many flowers in park bloom together. It must be very beautiful.____?

B:Good idea. My sister Lucy also likes flowers very much. Let's invite her to come with us.

A:Why not? ____. Sa we can take some wonderful photos.

B:Great. I like taking pictures. ____ ?

A:Let's meet outside the school gate at half past nine in the morning.

B:How shall we go there?

A:Let's go there by bike.

B:Oh, my bike is broken. ____?

A:All right. See you!

B:See you!

下列语句正确的是（　　）