1 . Whenever and wherever disasters happen — 9/11 Attacks in New York 14 years ago or the explosion in Tianjin on Wednesday night — it is always the firefighters_________take the lead to run to the very center,_________(save) lives by risking their own. （用适当的词填空）（所给词的适当形式填空）

2 . A dozen parks ___ in recent years, ________ as both tourism destinations and natural oxygen bars.

A．was built; to serve	B．have been built; serving
C．built; serving	D．have built; served