从A、B、C、D四个选项中，选出可以填入空白处的最佳选顼，并在答题卡上将该项涂黑。
( ) 1. After ______ long search for information on ______ Internet, he found what he wanted to know about Tibet.
A. the; the B. the; / C. a; / D. a; the
( ) 2. — Will you go to Sandy’s birthday party?
— I won’t go unless Tony______.
A. was invited B. has invited C. is invited D. will be invited
( ) 3. —Mr Green looks very serious.
—______he is very kind.
A. So B. But C. And D. As
