what / that thing (used in place of words you can't remember at the moment.)

what

what is this?

to develop a gap / (idiomatic) to cause an estrangement between two people

(idiomatic) A piece of cake; an extremely simple thing, something trivial, a cinch, easy as pie.

朝飯前: A piece of cake; an extremely simple thing.

(telephony) a common Japanese telephone greeting: hello; used when answering the telephone / used to confirm that the person being addressed is listening, or to confirm if anyone is listening

put away

let's see; what have we got here

which (of three or more) / which one /