The first step in the study of any language is observing and ____ precisely what happens when native speakers speak it.
鹿特丹港( ROTTERDAM )是我国国际海上集装箱货物运输挂靠的主要港口之一，该港口位于（）上。
____the center of our planetary system was considered as heresy by the church in the Middle Ages.
The landlady was very strict. She asked that we ____ television on week nights.
How many types of business meetings?
The two main print media is : （）
The children should go to school instead of to support their families.
I still remember the days ____ we studied together.
The city government has determined to get _____ with people who try to escape payingtaxes.
A business meeting agenda is plan _ _a business meeting.