题目内容：

阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。

An American boy went 1.(miss) three days ago, 2. has received people’ great interest. Several people gave different descriptions of his 3.(disappear).

His sister, 4.(age) nine, says she heard her brother 5.(return) home at about 11p.m. When she went to bed, she was frightened at lots of strange creatures 6.(stand) inside a spaceship outside. She is sure the aliens took her brother.

His parents became worried and called the police when their son didn’t show 7. for lunch the next day.

Some people also say that aliens took one of them aboard the UFO so that they could do research on her. 8.(luck), she returned safely.

When 9. (ask) about the possibility that the boy was taken by aliens, the police say 10.they haven’t dismissed the idea, they will not give up until they find out what happened.