下列各句中加点词“而”的理解与其它三项不同的一项是（ ）

Flight MU257 _______________ I must be off now.—Have a nice trip.

I go to school ______ my father’s bikeevery day.

We must _____ to the endless argument so that we can calm down and settle the problem. [ ]

.______ your timely warning, we would have been unaware of the danger