从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
1．—How long has this bookstore been in business?
—_______ 1996.
A．After B．In C．From D．Since
2．Thanks to the satellites, football games come to us _______ on TV.
A．living B．lively C．alive D．live
3．School children must be taught how to deal with dangerous _______ .
A．states B．conditions C．situations D．positions
