Scientistsdoubtwhetherit’s________toregulateone’sbiologicalclockbydrinking.
Thevolunteerswouldrathergobytrainthan________.
Hesaidthathe____(feed)upwithcollegeinstructorswhotriedtoteachhimtousethe“scientific
I’vegottheorderfromthebossthatthework_______finishedbefore5p.m.today.
Ifyouarewalkingawayfromaclocktower，youwillhearthetickingoftheclockfadetoapoint________itcannotbeheard.
