1．He got promotion (晋升) because of his special contributions to the company.
2．He paid an annual (每年的) visit to his middle school teacher.
3．These creatures live in the depth (深度) of the Pacific Ocean.
4．Christopher Columbus is one of the most famous explorers (探险者) in history.
5．Shanghai is the biggest commercial (商业的) city in China.
6．Every effort was made to rescue the victims trapped (困住) by the earthquake.
7．When I began my senior high school, I found it extremely (极端地) difficult to learn English well.
8．Many people have come to realize that they should go on a balanced (均衡的) diet.
