Not only Jack but also I ______ crazy about the football match.
本题考查not only...but also...连接并列主语时的用法。not only...but also...连接两个并列主语时，谓语动词遵循“就近原则”，根据可知此处应用be动词am，故答案为A。
—Will there be paper in school in 100 years?
—________.
本题考查“Will there...?”结构的答语。肯定回答是“Yes,there will.”，否定回答是“No,there won't.”，故答案为B。
I think he _______ in America next year.
本题考查动词时态。根据next year可知，此句要用一般将来时，故答案为D。