问题1：only 修饰 few，通常要与 a 连用。

Only a few children have read this book.

只有几个孩子看过这本书。

所以only a few就是few，再看看其他用法，few修饰可数名词复数。

2．few (= not many; hardly any)含否定意义；a few (= some; several; a small number of) 含肯定意义。

3． not a few = no few = quite a few = a good few = many。

4． 当 few受 every, last, past, next, some, very等词所修饰时，表示肯定意义，few之前不再有冠词。如：

In the last few minutes, he checked up his paper again.

It took us some few days to repair the machine.

They are very few in number.

There were too few of them.

He goes to see his grandma every few weeks.

问题2：考虑到该句式建议类型，应该用some。

some和any 既可以修饰可数名词又可以修饰不可数名词，some常用在肯定句中，而any则常用在否定和疑问句中。因此 some和any 的用法主要是考虑用在肯定句、疑问句还是否定句中，与名词的可数与否无关。

some意为“一些”，可作形容词和代词。它常修饰可数名词复数。如：some books一些书，some boys一些男孩，也可修饰不可数名词，如：some water一些水，some tea一些茶叶，some常用在肯定句中。any意为“任何一些”，它也可修饰可数名词复数或不可数名词，常用于疑问句和否定句。如：

--I have some tea here. 我这儿有些茶叶。

--I can’t see any tea. 我没看见茶叶。

--Do you have any friends at school? 你在学校有些朋友吗?

--I have some English books, they are my best friends. 我有英语书，它们是我最好的朋友。

但在表示建议，反问，请求的疑问句中，或期望得到肯定回答时，多用some而不用any。如：

Would you like some coffee? 你要不要来点咖啡?

What about some fruit juice? 来点水果汁如何?

当any表示“任何”的意义，起强调作用时，它可以用在肯定句中；

Any student can answer this question.任何学生都可以回答这个问题。