1. The police are _______ for the preservation of public order and security.
A. responsible B. suitable C. accessible D. indispensable
2. All flights _______ because of the heavy fog, we had to decide to take the train.
A. were canceled B. having canceled C. having been canceled D. have been canceled
3. All our preparations went _______ because the exams were called off.
A. at nothing B. beyond nothing C. for nothing D. ito nothing
4. I must go now. _______, if you want that book I'll bring it next time.
A. Accidnetally B. Incidentally C. Occasionally D. Subsequently
5. It does harm to children's growing up healthily to _______ the Internet computer games.
A. take in B. take on C. take off D. take to