Can you solve such problems ___raised by the audience?

Can you solve such problems ___raised by the audience? can you solve such problems as raised by the audience can you solve such problems__raised by the audience填什么, Can you solve such problems____were raised by the audience? you can easily solve the problems by--- (work) The problems are such that we can't solve by ourselves. The problems are such _____ we can't solve by ourselves.A as Do you learn English by(solve) the grammar problems? 句子only in this way can you solve the problems. The problems are such difficult ones that we can't solve the Who can solve the following math problems? who can help me solve the problems?