根据句意，用括号内所给单词的正确形式填空
This costume is made of ____ (nature) material.
Today ____ (near) every family in our country has a TV set.
In ____ (north) parts of America, people often wear warm clothes in winter.
The machine should be ____ (heat) before we use it.
As the old ____ (say) goes, “Time waits for no man!”