There is a new problem involved in the popularity of private cars ___ road conditions need___(improve) 为什么第一格只能用that不用第二格为什么填to be improved 不填improving

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Thereisanewprobleminvolvedinthepopularityofprivatecars___roadconditionsneed___(improve)为什么第一格只能用that

There is a new problem involved in the popularity of private cars ___ road conditions need___(improve) 为什么第一格只能用that不用第二格为什么填to be improved 不填improving
There is a new problem involved in the popularity of private cars ___ road conditions need___(improve) 为什么第一格只能用that不用
第二格为什么填to be improved 不填improving

There is a new problem involved in the popularity of private cars ___ road conditions need___(improve) 为什么第一格只能用that不用第二格为什么填to be improved 不填improving
第一个that引导的是修饰problem的从句,或者用of which,前面需加逗号.
第二个用to be improved的理由是:to be done表示待做,待解决,同时表示被动语态.这里可以用improvement,但不能用动名词improving,因为需要强调将来完成的动作和被动.

个人觉得都可以
need doing=need to be done