句型 I find it. / Here it is. — 英语填空题

情境：小明找不到他的铅笔。妈妈问他。请根据句型 I find it. / Here it is. 完成对话（每空一词）。 Mum: Is this your pencil, Xiaoming? Xiaoming: Oh, ___ it is! Thank you, Mum. Then Xiaoming looks for his eraser (橡皮) under the desk. He is happy and says: I ___ it!