New words：

assistant [əˈsɪstənt] n. 助理；助手

Sample Sentences：

My father hired an assistant to help with his work.
The chef’s assistant washes vegetables and cuts meat.
The assistant in the library showed me where the storybooks are.

chef [ʃef] n. 厨师,尤指主厨

New words：

expense [ɪkˈspens] n. 费用；开支；花费；开销

Sample Sentences：

The results are well worth the expense.
We must limit the expenses to $100 a month.
It's a great expense to have the whole house painted.

New words：

loyal [ˈlɔɪəl] adj. 忠诚的；忠实的

Sample Sentences：

A dog is a loyal friend to its owner.
He remained loyal to his country all his life.
Her whole family were loyal supporters of the Lakers.

New words：

being [ˈbiɪŋ] n. 存在；生存；生物；
human being n. 人类;人

Sample Sentences：

A dog is a loyal being.
Humans are intelligent beings.
Food and water are basic for human being.
Water is important for the being of plants.

loyal [ˈlɔɪəl] adj. 忠诚的；忠实的

New words：

bury [ˈberi] v. 埋葬；埋藏；使沉浸于；使专心于

Sample Sentences：

He buried himself in reading all day.
The house was buried under ten feet of snow.
Your letter got buried under a pile of papers.
In peace, sons bury their fathers; In war, fathers bury their sons.