Modern English words man, woman, child, eat, fight, etc, originate from ______.
Theothertimingsystembelongsinourinternalclocks，which，left________，wouldtiethebodytoa25-hourrhythm.
Lying under the skull, the human brain contains an average of ten billion nerve cells called ______.
There is a growing body of evidence to support the fact that most people suffer from a lack of daydreaming _______ an excess of it.
Thebasicunitinthestudyofmorphologyis______.
