Ⅰ、1、gate
2、bottle
3、president
4、works
5、metal
Ⅱ、1 - 5 C A D D C
Ⅲ、1、about/of
2、at
3、for
4、of
5、up
Ⅳ、1、pulled down
2、upside down
3、put;to good use
4、brings back
5、is known for/is famous for
Ⅴ、1 - 5 D C A B A
6 - 10 D C B C A
Ⅵ、1、Ten./10.
2、When they saw a need for more recycling.
3、To improve students' interest in science and math.