Jack is _____ busy ______ he often forgets to have breakfast.
A：too; to
B：enough; to
C：so; that
D：because; so
研究发现，中学生在晚上10时前入睡，且睡足9个小时，更有利于垂体分泌促进人体生长所需要的激素，这种激素是（ ）
Suddenly, a light ____ ____. I saw a man in black standing in front of me.
