补全对话。从方框中选择一个适当的句子填入空白处，使对话完整。

Mary: I called you at 7:00 last night and you didn't pick up.?

Jack: Oh, I was helping my mom in the kitchen.

Mary: I see. I called again at 8:00, and you didn't answer then either.

Jack: Oh, I know. When you called me, I was taking a shower.

Mary: But then I called again at 9:00.

Jack: Oh,

Mary: So early? That's strange.

Jack: Yeah, I was too tired.

Mary: I needed help with my homework.