It’ll be another 50 years _________ China is expected to reach the level of a medium developed country.
| A．since | B．before | C．that | D．when |
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 |
The scientific awards, like the Nobel Prize in 2015, are equal to all, ______ the research findings are good enough.
| A．so | B．as long as | C．although | D．even though |
A common memory they all have ______ their school days is the school uniform.
| A．on | B．of | C．to | D．with |