1、Is it easy for them ( )a plane?
A、to making B、making
C、to make D、make
请问：选哪一个，为什么呢？

2、You'd better ( )there on foot.It’s very far from here.
A、not go B、not to go
c、not D、go not
第二题怎么翻译？选取哪个答案？为什么呢？

请老师释疑解惑，谢谢！

1. c.
这是不定式的复合结构，for sb to do sth。类似的还有：
It's important for us to learn English well.
It's useful for us to have a dictionary around.
尤其出现在上述句型中哦
It's important/easy/difficult for us to do sth

2. a
had better +动词原形 “最好...”
否定式为：had better not+动词原形 “最好不要...”
你最好不要步行去那儿。那儿离这里很远。