从A、B、C、D四个选项中，选出可以填入空白处的最佳选项，并在答题卡上将该项涂黑。
6. --- How many VIP will attend tomorrow’s conference?
--- _____. Maybe around 40.
A. I don’t know B. I’m not sure C. It is a puzzle D. It doesn’t matter
7. _____ police officer who didn’t want to reveal his identity said the police had found a clue which would help them catch _____ robber.
A. The, a B. A, a C. A, the D. The, the
