题目内容：

阅读下面短文，在空白处填入一个适当的词，或填入括号中所给单词的正确形式。

Using a tea bag is most westerners' favorite way of drinking tea.Do you know how it came about?

The tea bag was invented in 1908 by Thomas Sullivan，an American tea 1.(sell)．He was sending out free tea in silk bags 2. people to try.People put the bags together with the tea 3.(leaf) into the cup and added hot water.The tea tasted good，and people thought it was easy 4.(clean) the cup.They were not happy when Sullivan started sending them the loose tea(散装茶) again.

Sullivan 5.(realize) that he had a hot new thing in his hands，and he built 6. machine to pack the bags.7. tea bags became popular，they were changed from silk to gauze(薄纱) and later paper.In 1952，Lipton Tea made the tea bag even more popular with its invention of the four­sided tea bag.Tea bags were soon a hit in the UK，and today about 85% of the tea in the UK is 8.(pack) in paper bags.

However，many people still prefer loose­leaf tea.This is because some tea companies put poor quality tea in 9.(them) tea bags.But for most 10.(drink)，tea bags are still an easy and tasty way to go.