New words：

cure /kjʊr/
n.治疗；对策；药；疗法
v.治愈；解决；矫正；治好（疾病）

Sample Sentences：

There is still no cure for a cold.
The only way to cure backache is to rest.
When I left the hospital I was completely cured.
He has blind faith in doctors' ability to find a cure.

New words：

riddle ['ridl] n.谜；谜语；谜题

Sample Sentences：

He could not solve the riddle.
He found out the riddle at last.
He got the answer to the riddle as quick as a flash.
Stop talking in riddles (= saying things that are confusing) ─say what you mean.

New words：

debt [det] n.债务；欠款；借款；恩情

Sample Sentences：

He has a lot of old debts to meet.
If I pay all my debts I'll have no money left.
The debt that he owed her could never be paid.
We'll run into debt if you spend more than our income.

New words：

issue ['iʃju:] n. 问题；重要议题；争论的问题

Sample Sentences：

There was no issue at all between us.
If you have any issues, please call this number.
This is a big issue ; we need more time to think about it.
They have published a lot of new books on international issues.

New words：

troublesome ['trʌblsəm] adj.令人烦恼的；讨厌的；令人痛苦的；困难的；棘手的

Sample Sentences：

This naughty boy is really troublesome.
He needed surgery to cure a troublesome back injury.
The traffic jam has become a very troublesome issue of human life.

issue ['iʃju:] n. 问题；争论点；发布