In Copenhagen Climate Conference，rich countries promised to________a fund of $ 100 billion a year by 2020 to help developing countries.[ ]

Do you know anything about the players of our school basketball team—Yes. They are _______ young boys between the age of thirteen and fifteen.

Who comes toschool , Jerry or Martin?

We’ll eat as soon as the meat is done—It has__________to cook for another five minutes

下列各组加点词的解释，全都正确的一项是（ ）