6唯物辩证法的总特征是()

2.My mother knows Jane; they ( ) to each other at a party.

1.It remains a question when the new classroom building ( ).

2. By the time you get to Greenwich you ( ) the most historic parts of London.

1. My niece has been to Sumatra(苏门达腊) and Iran(伊朗) as well as all of Europe. By the time she＇s twenty, she ( ) almost everywhere.

1. "How long had you been waiting before Mr. Winter finally arrived?""Well, he came at three o＇clock, and I ( ) the day before."

3. "You haven＇t got the textbook for my chemistry course yet.""I know, and we ( ) to get it for the last five weeks."

2. Though they ( ) side by side for twenty years, the two neighbors are not very friendly.

1. "Everyone in the club ( )."

6. "When did you decide to be a doctor?""Let me see. I＇m twenty, and I have wanted to be a doctor since ( )."

5. Lead ( ) as a material for sculpture since the time of the early Greeks.