So far scientists have only acquired ________ understanding of the physical processes that cause earthquakes.

As to the various pollutions,which of the following is NOT true?

When ________ to tell the difference between British and American English, the linguist made a long and ________ speech.

A linguistic theory is constructed about what ______ is and how it works.

The volunteers would rather go by train than ________.

Since the premium varies with the scope of ____ extra premium is for buyer ' s account, should additional siske covered?( )

—You were brave enough to raise objections at the meeting.

— Well, now I regret ________ that.

We ________ go out to restaurants, but mostly we eat at home.

Our payment terms (付款方式)are ___ , irrevocable letter of credit for the full invoice value.( )

Younger children are curious ________ how things work ，and many of them want to take apart everything within their reach.