We were struck by the limited use __________ their natural resources.
| A．those villagers made of |
| B．which those villagers made |
| C．for those villagers made of |
| D．for those villagers making of |
75. When on holidays, the railways put on _____ trains to make people’s travel more convenient.
| A．regular | B．special | C．particular | D．Unusual |
76. All flights _______ called off because of the terrible weather, they had to go there by train.
| A．were | B．had been | C．being | D．having been |
77. --- Have all the important letters been delivered at the first time?
--- I’m sorry. _______ only 40% of them.
| A．It is | B．They are | C．There are | D．It has been |
78. --- You _____ repay this debt this week according to the agreement.
--- Don’t worry. I _______ pay it off before the deadline.
| A．must; will | B．shall; must |
| C．should; am due to | D．shall; am bound to |
79. Ming and Qing tombs have ______ relatively undamaged. They, ______, have suffered some damage from centuries of exposure, wars and deliberate destruction.
| A．left; nevertheless | B．been remained; however |
| C．survived; though | D．excited; yet |