I am always interested in traveling. My reasons are quite (extremely) simple and clear. If anybody is not satisfied with my viewpoint(s), I shall be greatly surprised at his ways of thinking.
In the first place, traveling increases our knowledge. Only by traveling can we see (因为用(only)开头，主动词须颠倒)things outside our home town.
In the second place, traveling is good to our health. While we are traveling, we usually exercise our bodies.
In conclusion, I earnestly hope that everybody must seize (grasp at) the opportunity of traveling.
My aim is to become a good citizen so as to be able to render service to the (my) country. However, to become a good citizen is not an easy thing. He has many duties to fulfill.The first duty of a good citizen is to love his country. He is to (must) be ready to sacrifice even his own life for the country.His second duty is to obey the law and help the government (to) maintain order. If everybody can do so, the country will be rich and strong (powerful).
it is the duty of every citizen to honor the national flag. Why? Because the national flag is the symbol of a (the) country. To respect it means to respect the country. In other words, if a man loves his country, he must love the national flag.
In school, the national flag is usually raised at a certain time every day. Then the principal, teachers, staff and students are to (must) stand before it and sing the national anthem. It is indeed extremely meaningful to attend such a ceremony.