The ________ at the military academy is so rigid that students can hardly bear it. A) convention B) confinement C) principle D) discipline 2.The test results are beyond ________; they have been repeated in labs all over the world. A) negotiation B) conflict C) bargain D) dispute 3.I was so ________ in today’s history lesson. I didn’t understand a thing. A) amazed B) neglected C) confused D) amused 4.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 5.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