下列各句中，加点的成语使用恰当的一项是（ ）

The flight attendant welcomed us ___ theplane.

on’t you go to medicof _____with long training,which I am afraid I don’t have.

Miss Green often said “God helps those who help themselves”, intending to ________ on us the significance of being independent.

When did your daughter go to sleep last night —She didn’t go to bed ______ shefinished her homework.