6. The ________ at the military academy is so rigid that students can hardly bear it.

A) convention B) confinement C) principle D) discipline

7. The test results are beyond ________; they have been repeated in labs all over the world.

A) negotiation B) conflict C) bargain D) dispute

8. I was so ________ in today‘s history lesson. I didn’t understand a thing.

A) amazed B) neglected C) confused D) amused

9. It ____ you to at least 50% off the regular price of either frames or lenses when you buy both.

A) presents B) entitles C) credits D) tips

10. Deserts and high mountains have always been a ________ to the movement of people from place to place.

A) barrier B) fence C) prevention D) jam

DDCBA