When you drive home, you can’t be＿＿＿＿＿＿＿careful. 

We should’t only be satisfied with the present life, We are trying to look ______ and see what our future will be like.

_____ three influenza type A virus subtypes(子类型) have been found in pigs.

The incomes of skilled workers went up. ____, unskilled workers saw their earnings fall.

Tonny’s parents thought he was at school，but________he was in a net bar.