The graduating students are busy _______ material for their reports.
| A．collect | B．to collect | C．collected | D．collecting |
Some schools, including us, will have to make ______ in agreement with the national soccer reform.
| A．attachments | B．adjustments | C．comments | D．achievements |
Languages across the world are becoming extinct ______ endangered mammals and four times endangered birds.
| A．at twice the rate of | B．as twice fast as |
| C．twice faster as | D．twice at rate of |
Every 40 minutes we will take a 20-minute break, ______ your guide will give a short talk on different aspect of the Great Wall.
| A．during that | B．and when | C．which | D．during which time |
It is generally believed that Watson and Crick’s discovery about DNA was ____ beginning of _____ enormous advances in _____ field of genetics.
| A．the, the, the | B．/, /, the | C．the, /, the | D．the, the, a |
Schools should be lively places where individuals are encouraged to ______ to their greatest potential.
| A．cultivate | B．accelerate | C．expand | D．develop |