【推荐1】They’re doing clinical ________ on a new drug.
他们正在对一种新药进行临床试验。

【推荐1】His friend has ______________(患病) ill health for some years.

【推荐2】He ______ (finish) writing his novel.
他已经写完了他的小说。

【推荐3】Have you ________ ________a date for the speech contest?
你们定好演讲比赛的日期了吗？

【推荐2】as引导原因状语从句
________ these stories were often quite long, they often had formats and rhythm to help people remember them more easily.
由于这些故事通常很长，所以通常有格式和节奏，以帮助人们更容易记住它们。

【推荐1】She _________________when she was a child.   
当她很小的时候，她就喜欢唱歌。

【推荐2】园区票价的价格从65美元到150美元不等。
Prices ___________ ___________ 65 ________ about 150 US dollars.