Generally speaking, green products refer to all goods that are environmentally______.

Since　the　matter　was　extremely＿＿，we　dealt　with　it　immediately．　　

31. – How did your father catch so many fish?– By using a ________. 

Although he sometimes loses his temper, his students like him＿＿＿＿＿for it. 

The illness of her son is so ______ that she cannot go to sleep at night.