阅读短文，回答下面的问题。

      Our neighborhood used to be very quiet. However, these days, strange things are happening in our

neighborhood and everyone is unhappy. Zhou Gu, the local school teacher is extremely worried. When he

was interviewed by the local newspaper, he said, "Every night we hear strange noises outside our window.

My wife thinks that it could be an animal, but my friends and I think it must be teenagers having fun. My

parents called the police, but they can't find anything strange. They think it might be the wind. I don't think

so!"

      Zhou's next door neighbor Qi Hui is unhappy too. "At first, I thought it might be a dog, but I can't see a

dog and I still hear the noises outside." Everyone in our neighborhood is worried, and everyone has his or

her own ideas. There must be something visiting the homes in our neighborhood, but what is it?

1. These days our neighborhood is not as ______ as before because of some ______ things.

2. Zhou Gu's wife thinks the strange noises could be made by ______ ______.

3. While teenagers are ______ ______, they may also make noises.

4. Qi Hui, Zhou's ______ ______ neighbor is unhappy, too.

5. There must be something visiting our neighborhood but no one knows what ______ ______.