Insert an adverb

Hello Teachers,

1.They live in Japan.(somewhere).

2.It is an easy sum.(extremly).


I have to insert these adverbs in brackets in the given sentences.


For (1)


They live somewhere in Japan.

or

They live in Japan somewhere.

Or

Somewhere They live in Japan.


For(2)


It is an exttremly easy sum.


Which ones are correct?

Thanks.