I’m concentrating rny efforts_________writing a novel.[ ]

下列各句中，没有语病的一项是（ ）

Excuse me, Sir. But smoking is not allowed here.—Sorry, I didn’t see the sign. I’ll _______ mycigarette at once.

b market and the social expectations of students, with the education system, form a big challenge for society.

After hearing the news, they looked at each other _______ surprise.