The police are trying to find out the ________ of the man killed in the traffic accident.

I should like to try that coat on, but I don t know if it is my ____.

Many kinds of birds fly south at the ______ of winter.

It even leaves the scientists in _______what they should call the newly born creature, which looks half-human and half-animal.

You should read the ______in the car repair manual(手册)carefully before you start.