New Words：
chemical [ˈkemɪkl]
n.化学品；化学制品
adj.与化学有关的；化学的
Sample Sentences：
You must be careful when handling chemicals.
Dad brought all kinds of chemicals to kill slugs.
The land has been completely poisoned by chemicals.
Chip worked as a packer in a local chemical factory.
He said chemical weapons had never been sited in Germany.
I want to have a discussion with you on the price of your chemical products.
poison [ˈpɔɪzn]
n.毒药；毒物；毒素
v.毒害；下毒；毒死
New Words：
improve [ɪmˈpruːv] v. 改进;改善
Sample Sentences：
I need to improve my French.
I wish I could improve my spoken English.
How can I improve my writing if I cannot write complete sentences?
New Words：
practise [ˈpræktɪs] v.练习；训练
practice [ˈpræktɪs]
n.实践；练习；训练
v.〈美〉同“practise”
两者的区别：
英式英语中，practise 被用作动词，而 practice 被用作名词。
美式英语中，practice 被用作名词和动词，不用 practise。
Sample Sentences：
Can we practise French together?
If you practise speaking English, you'll soon improve.
She does an hour's piano practice every day.
Practice is the only way to learn a language well.
There's a basketball practice every Friday evening.
improve [ɪmˈpruːv] v. 改进;改善
New Words：
entrance ['entrəns] n.入口；进入；
Sample Sentences：
Guard the entrance. No one gets in or out.
The entrance gates were locked at midnight.
He took the entrance exam but didn't get in.
There's only one little entrance to the entire building.
New Words：
enter [ˈentər] v. 进入；进去；加入；进来
Sample Sentences：
Where did the bullet enter the body?
The twins will enter the fourth grade tomorrow.
Please do not enter before knocking on the door.
Her dream to enter the famous university came true.