2. Now the mystery is       (解决).People in our town can sleep well and full of energy during the day.

1. We now      (知道)what was happening in the neighborhood. From now on,there is no more mys?tery out of the window.

用might, could,can,must,can't填空。

1.1 can't find my concert ticket and I was anxious. My mother said I       leave it at school but forgot to bring it home. But I never took the ticket to school, so it      be at school. 

2. This morning someone helped me clean the classroom,but I don't know who did it. I think it be Lin Tao. He is warm-hearted and always helps the classmates. But I didn't see him this morning. Someone told me that he was ill at home today. So it       be him. Then,it       be Wang Lin. He is my best friend,and he       help me clean the classroom. I asked him and he said he didn't do that. I felt confused. 

3. Some students think the wallet       belong to Maria. But I think it       be Mary's because there is a photo of Jay Chou in the wallet. And she likes Jay Chou very much.

7. There have been strange crop       (圆圈)on the earth for many years. It's so amazing！All our classmates wonder how they appear.

6. I'm on duty today. So I went to school earlier than before to clean the classroom. But to my surprise,

the classroom was very clean.        (某人)has cleaned it. I wondered who did it.

5. I'm really worried,because I lost an ancient coin. It is very      (有价值的）.

4. My classmates and I have found a      (粉红色 的)wallet on the playground. We discuss about

w      wallet it is.

3. These days,something unusual is happening in our town. We're really nervous because every night we

hear strange      (噪音)outside our window. It made us not sleep well at night and feel s       during the day.

2. A strange man came while I was having a       (野餐），but soon I couldn't find him.

1. I planned to a       a concert yesterday but my ticket disappeared.