在下面两段话空缺处依次填入词语，最恰当的一组是（ ）（1）竹是什么呢竹本固，不 ；竹心空，不 ；竹性直，不趋炎附势；竹节贞，不改志向，所以，竹是君子的化身。（2）无论如何作出结论，有一点是的 ：柏杨首先是一个文学家，然后才是文化学者和历史学家。

Dropping litter ______ never allowed in our city.

I have been keeping the portrait ______ I can see it every day, as it always reminds me of my childhood in Paris[ ]

Our English teacher can sing songs ______.

_____ does she like pandas—Because they’re very cute.