The boy said _____ couldn’t he work out the problem but his teacher didn’t know how to do it[ ]

Everyone kept silent and tried to come up with an idea to _________ this problem.

Yesterday, I visited a middle school in Taiyuan. There are about students in it.

There are __________ approaches to English teaching.But not all of them are equally efficient for our Chinese students.[ ]

Can you tell me ___?