下列各句中，加点的成语使用恰当的一项是 （ ）

When you stand on the top of the mountain and overlook the surrounding scenery，you’ll find it is________to climb it up with effort.

I’ll never forget the day _________ I was born．

Will you go there with us next week—No. I there twice.

I can tell him ___________ because he has a big mouth. He can never keep a secret!