New words：
average ['ævəridʒ]
n.平均水平；平均数；一般水准
adj.平均的；典型的；正常的；普通的
v.平均为；计算出…的平均数
Sample Sentences：
The average of 4,6 and 8 is 6.
If you average 4, 5 and 9, you get 6.
The average age of the boys in this class is fifteen.
There was nothing special about the meal; it was average.
New words：
rate [reit] n. 率；速度；比率；价格
Sample Sentences：
We drove at a steady rate.
The school has a 90% pass rate.
What's the rate for a single room?
House prices are rising at a higher rate than before.
Most people walk at an average rate of 5 kilometres an hour.
average ['ævəridʒ]
n.平均水平；平均数；一般水准
adj.平均的；典型的；正常的；普通的
New words：
crime [kraim] n. 罪；罪行；犯罪活动；罪过
Sample Sentences：
The crime rate is rising.
It's a crime to waste food.
When will the police solve the crime?
Many people believe that prison isn't a cure for crime.
rate [reit] n. 率；速度；比率；价格
New words：
vehicle [ˈviːəkl] n. 车辆；交通工具；载体；运载工具
Sample Sentences：
Air is the vehicle of sound.
Are you the driver of this vehicle?
No vehicles are permitted into the park.
Language is the vehicle of human thought.
New words：
deny [di'nai] v.否认；拒绝；否定；不承认
deny to do 强调动作的未来性或未完成性，通常用于表示拒绝去做某事deny doing 强调动作的完成性或已发生性，通常用于表示否认做过某事
Sample Sentences：
He denied to go to the party.
He denied going to the party.
There's no denying that he was a great man.
He denied knowing anything about their plans.
No one can deny that smoking is bad for your health.