1 . Astronauts usually sleep in private quarters or in sleeping bags________(attach) to the walls or the ceiling. (所给词的适当形式填空)

2 . I still remember the happy days ________(spend) with the students from other cities at the summer camp. （所给词的适当形式填空）

3 . The music took me through the twists and turns of a classic story about a young couple ________ by their families．(根据句意填空)

4 . I think the scientific advances ________ (mention) in your article are fantastic! (所给词的适当形式填空）

5 . Prices of daily goods________through a computer can be lower than store prices.

A．are bought	B．bought
C．been bought	D．buying

6 . Three Kingdoms is a funny game ______ around the popular classical novel Romance of three kingdoms(三国演义) by Luo Guanzhong.

A．having built	B．being built
C．to be built	D．built