I don’t know ______ with this problem.It’s too hard. —Youcan ask Mr Wang for help.

How old are you, madam?— If you _____ know, I’m twice my son’s age. [ ]

I don’t know the result for sure, but ________ with you, I don’t think our team won an advantage over theirs in yesterday’s competition.[ ]

下列文学文化常识，表述错误的一项是

The International Maths Summer Camp was held in Wuhan,____ the top students in maths from all over the world.