1.this is the most important thing that we should pay attention.

1.this is the most important thing that we should pay attention.
2.this is the most important thing to that we should pay attention.哪句是对的
3.i had no idea how long he would been back home before he had to leave for work again.这句对吗
4.nobody says a word about the incident,do they?
不好意思啦,