New words：

upgrade ['ʌpgreid] v. 升级；提升；提高；改进；改善

Sample Sentences：

Your phone needs a software upgrade.
We need to upgrade the status of teachers.
Harvard College was upgraded to the university status.

status ['steitəs] n. 地位；身份；状态

New words：

graduate ['grædjueit]
n.毕业生；
v.毕业；授予学位

Sample Sentences：

Mary was graduated from Oxford.
It is three years since he graduated.
The college graduated 50 students last year.
Graduates from our school are working all over the island.

New words：

occur [əˈkɜː(r)] v. 发生；出现；存在于；出现在；被想到；想起

Sample Sentences：

A brilliant idea occurred to me.
Do giraffes occur in Africa only?
When did the earthquake occur/happen?
Food shortages often occur in time of war.
That plane crash occurred only minutes after take-off.

New words：

observe [əb'zə:v] v.观察；看到；庆祝；监视；遵守（规则、法律等）

Sample Sentences：

Didn't you observe the difference?
This law must be strictly observed.
I observed him entering the bank with a gun.
They carefully observed the behavior of deer.
Do you observe Christmas Day in your country?

New words：

dishonor [dis'ɔnə]
n.耻辱；丢脸；【商】(票据的)拒绝付款
v.使丢脸；不尊重；不履行

in honor of 向…表示敬意；为纪念

Sample Sentences：

He would rather die than live in dishonor.
What he had done brought dishonor on/to the family.

What he had done dishonored the family.
He dishonored his team by cheating during the competition.

Many people plant things in honor of Earth Day.
We should mark his name down in history by having a school in honor of him.