1 . A committee ________ to the Egyptian buildings and prevent the loss of cultural relics. Experts ________, conducted several tests, and then made a proposal for how the buildings could be saved. Finally, a document was signed, and the work began in 1960. (根据课文内容填空)

2 . Thousands of houses were ________ (破坏) in the horrible earthquake.

3 . Teenagers       their health because they play computer games too much.

A．have damaged

B．are damaging

C．damaged

D．will damage