下列各句中加点的成语（熟语），使用不恰当的一项是

Only when _____ possible to settle the problem how to get the machine repaired

We want someone to design the new art museum for us.-_____ the young fellow have a try?

So far Billy ________ five Chinese songs. He really feels proud of himself.

My daughter comes home from school and then spends an hour on the phone talkingto the very people she has been at school _____ all day