When my sister left college, she got a job as reporter in a newspaper office.
Languages across the world are becoming extinct ______ endangered mammals and four times endangered birds.
Every 40 minutes we will take a 20-minute break, ______ your guide will give a short talk on different aspect of the Great Wall.
It is generally believed that Watson and Crick’s discovery about DNA was ____ beginning of _____ enormous advances in _____ field of genetics.
Schools should be lively places where individuals are encouraged to ______ to their greatest potential.
The scientific awards, like the Nobel Prize in 2015, are equal to all, ______ the research findings are good enough.