已经不错了!1)"And the (solution) to this (problem) " = (a) "And solutions 复数 to the problem"; (b) "And the solution 单数 to the problem" (都可以).2) "Have you [ever= 删] heard about [the=删] undergraduates who moan because ofdepression? Do you know anyone who faces stress in study?It is unfortunate/sad that the mental health problem...
