The government should develop systemto predict when wildfires occur andgivewarnings in time

______, they make mistakes as part of their everyday behavior. [ ]

It is said that many kids are worried about the year 2012, ________, they think the earth will be destroyed by disasters[ ]

Why must we invite him to our discussion —-Her opinion because of her experience.

Passengers must not leave their seats ________ the plane comes to a full stop.