题目内容：

根据句意、首字母及所给汉语意思写出所缺单词

1.He looks sad.What’s the m___________ with him?

2.Can you         （想像）what happened to the Malaysia airplane?

3.There’s something wrong with my _____________ (胃)

4.Don’t be _______________(担忧的) before the exam.

5.Can’t you see the _______(标志) “No smoking”?