按要求完成句子用现在完成时改写下列句子，使A,B两句意思基本一致。每空限填一词。

1. A. We came to our school in 1980.

B. We ________ ________ ________ our school since 1980.

2.A. The old woman died four years ago.

B. The old woman ________ ________ ________ for four years.

3. A. The meeting began two hours ago.

B. The meeting ________ ________ ________ for two hours.

4. A. I borrowed two books last week.

B. I ________ the two books for a week.

5. A. When did the bus arrive here?

B. How long ________ the bus ________ here?