用所给词的适当形式填空。

1.  They______ (take) many photos in the park last year.

2.  —Who ______ (clean) the living room?

     —Kate did.

3.   Yesterday I ______ (hang) out with my best friend.

4.  The Greens went to the restaurant and______ (eat) some hamburgers.

5.  There are lots of______ (visit) in Europe every year.

6.  Tim______ (sleep) late yesterday.

英国学者李约瑟曾说：“每当人们在中国文献中查找任何一个具体的科技史料时，往往会发现它的主要焦点就在宋代。”下列属于宋代取得的科技成就是（  ）

A．活字印刷术

B．司南

C．造纸术

D．火药