仔细阅读下面五个句子，然后用下面方框中所给的单词或短语填空，使每个句子在结构、句意和逻辑上正确。（提示：选项中有一个是多余的）

If you don't____ a flash, then it may be OK.

When it began to rain, Ben was helping his mom____ dinner.

It could be Mei's hair band. Or it might____ Linda. They both have long hair.

The British teacher is very____ . He always tell us interesting jokes.

If you are always____ from class, you will fail the examination.