Puzzle 4

Long __; complicated mathematic task.

This circular trick might be taught after "stay".

Large amphibian with big croak, says ribbet a lot.

Illumination in a house.

Controls for carers to keep children safe online.

A doggie midsection might be calling out for one.

Something that didn't happen; a total let-down.

A painting of a person's face.

__ bottle; liquid-filled source of warmth.

Things asked for.