it's not____to cross the road when the traffic lights are red.(safety)water freezes .water turns into ice.(合并)_____water freezes,____turns into ice.

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it''snot____tocrosstheroadwhenthetrafficlightsarered.(safety)waterfreezes.waterturnsintoice.(合并)_____

it's not____to cross the road when the traffic lights are red.(safety)water freezes .water turns into ice.(合并)_____water freezes,____turns into ice.
it's not____to cross the road when the traffic lights are red.(safety)
water freezes .water turns into ice.(合并)
_____water freezes,____turns into ice.

it's not____to cross the road when the traffic lights are red.(safety)water freezes .water turns into ice.(合并)_____water freezes,____turns into ice.
1.safe
2.When,it