He looked at them_(surprised).

填什么,为什么,什么意思?

答案是surprise,why?

surprisedly,这个词是用来修饰looked at 这个动词的，应该填副词形势
如果答案是surprise前边一定要加上介词的 in surprise ,也许是我的才疏文薄，真没见过你说的那种句式
He looked at them surprise，我也在查一查，问问别人，你也再看看答案是不是给错了好不好

问题的关键是think better of，这是一个固定短语，意思是：改变主意, 重新考虑 类似的例句： 1. he wanted to speak but thought better of it and held in. 他很想说出来，但仔细想想还是忍住没说。 2. john told his mother he wanted to leave school, but later he thought better of it. 约翰告诉他母亲说他想退学，但后来改变了主意。 3. i was going to go, but i thought better of it. 我原来打算去的，后来又决定不去了。

surprisingly. 他惊讶的看着他们.look是动词后面要用副词修饰.

surprised 句意是：他看着他们，很惊讶。是被动的，用分词形式