下列关于阿根廷潘帕斯草原大牧场的叙述，正确的是（ ）
—Although my son failed the exam, he tried his best to________
— He is old enough to control his feelings.
下列句子中的标点符号使用都正确的一项是（ ）
o strongly that each of us has a role _______ in making the earth a better place to live on.