1. 不能加s，因为there be/exist/come结构的句子中，主语在be/exist/come后面。上面的主语是 problems和 responses，都是复数。
2.seem是系动词，后面可以接名词，“seem+名词”相当于“seem+to be+名词”。
当然这里改成satisfactory也是可以的。seem也可以接形容词。
barely（勉强）是副词，修...
1.There still exist many problems to be solved.和
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