What could be the possible reason for this? Some form of probationary period? Comments from students about your accent?

If you want to play along, although personally I would tell him to go forth and multiply, how about something from Winston Churchill, Margaret Thatcher, Tony Blair or David Cameron? Just joking, but it's very odd.

Thanks for all your replies on this!

I have decided it is China after all, and teaching jobs,much like girls here, come and go, therefore, not worth losing any sleep over.

I do agree with you though his request is strange.

GL all,
SMGS