——— Ring me at six tomorrow morning, will you? ——— Why that early? I ______ .
I’d like to take _____ of this opportunity to thank you for your help.
Most people would agree that nuclear science should be developed to benefit the human being ____ harm them.
Not until the early years of the 19th century _____ what heat is.
_____ food is stored deep in the tunnel for the use of war.
____ she couldn’t understand was _____ fewer and fewer students showed interest in her lessons.