题目内容：

阅读下面短文，按照句子结构的语法性和上下文连贯的要求，在空格处填入一个适当的词或使用括号中词语的正确形式填空，并将答案填写在的相应位置上。

Not all memories are sweet. Some people spend all   1.   lives trying to forget bad experiences. Now American researchers are developing a pill,    2.  will help people forget bad memories. The pill is planned to be taken immediately after a 3.   (frighten) experience. They hope it might reduce, or possibly erase, the effect of painful memories.

However, the new research has caused a lot of argument. Supporters say bad memories may ruin people’s lives. They come back    4.  us when we don’t want to have them in a daydream or nightmare(噩梦). They usually come with very painful feelings. The pill can help to reduce many ____5.____(suffer). But those    6.   are against the research say that changing memories      __7. (be) very dangerous because memories show who we are.

_____8._____the drug could first be used in only very serious cases, some people even fear that it would become more commonly used. Don’t forget people always have the ability   9.   (use) science for the wrong purpose. What we should do is help people to have     __10.   (good) control of memories.