be patriotic 要爱国
It is the duty of every citizen to make the country rich and powerful (To make the country rich and strong is…). In order to accomplish this object one must be patriotic (love his country). I consider this an unchangeable truth.
How can a student love his country (be patriotic)? I find my answer very simple and clear. He must study hard and store up knowledge so as to serve his (the) country in the future. If every student can do according to what I said, the country will certainly be rich and powerful.
the value of time 爱惜时光
An English proverb says that time is money. I consider it (this) wrong. Why? Because we all know that we can earn money be work but can not in any way get back time (in anyway). For this reason, we may (can) say that time is more valuable than money.
Many people do not know the value of time. It (this) is indeed a great pity. We must bear (keep) in mind that wasting time is equal to wasting your life.