初中英语小问题！

第2题填we go to one of our national parks to relax

is
are
lingling suggested that they go to one of their national parks to relax
问题2是个虚拟语气从句 seggest 等动词后边的从句要用虚拟语气，是suggest+（should）+vt原形形式 其中should可以省略

which are
that /which is
都是从句,但是两个可数单词就不能用that了

另外,eg. There is meat,bottles and papers.meat是单数

lingling suggested that they (should) go to one of their national parks to relax

suggest sb.(should) do sth

We should collect bottles and paper that _are_(be) abandoned.
因为 bottles and paper 视作复数（即便是两个不可数名词也是一样的），因为有“and”

We should collect bottles or paper that _is_(be) abandoned.
因为 bottles or paper 视作单数，主要由于中间有一个“or”
(当两个不可数名词时用is，一个可数一个不可数时用is，两个可数*复数*时就用are了)

Lingling said,"Why don't we go to one of our national parks to relax?"
转化为
Lingling suggested that _they ( should )go to one of their national parks to relax_