healthy chemistry pollution communication warn dangerous nature

（1）He drove so fast that I really felt my life was in

danger

danger

．
（2）Water is one kind of the

healthy

healthy

elements．
（3）The workers used a

chemical

chemical

to kill mice in the factory．
（4）The Japanese can not speak English．Would you please use Japanese to

communicate

communicate

with them？
（5）There is a

warning

warning

before the film in each DVD．
（6）We must stop that factory from

polluting

polluting

the river as soon as possible．