New words：

background [ˈbækˌɡraʊnd] n.背景；底色；幕后；经历

Sample Sentences：

Let me tell you the background of this story.
People from different backgrounds can be good friends.
The job would suit someone with a business background.
The mountain is the main subject, and the sky is the background.

subject [ˈsʌbˌdʒekt] n.学科；主题；问题；话题；科目；主语；主体

New words：

awful /ˈɔːfl/ adj.糟糕的；很坏的；非常的

Sample Sentences：

The weather was awful.
That fridge smells awful.
I feel awful about forgetting her birthday.

New words：

attempt [əˈtempt]
n.尝试；试图；企图
v.尝试；试图；努力

Sample Sentences：

I passed my driving test at the first attempt.
Don’t be afraid of failure—every attempt is a learning experience.

I will attempt to answer all your questions.
She attempted to solve the math problem but failed.

New words：

heal [hiːl] v. 治愈；愈合；(使)康复，复原

Sample Sentences：

It took a long time for the wounds to heal.
I put a bandage on the scratch to help it heal.
Plants can heal themselves after being damaged by insects.

New words：

raw [rɔː] adj. 生的；未烹制的；未煮的；未经加工的

Sample Sentences：

These fish are often eaten raw.
Are raw vegetables healthier than cooked?
This information is only raw data and will need further analysis.