Hi everybody,

I am trying to help my son in 5th grade and can not figure this out.

He has the following words:

accomplice, exultant, remorseless, sedate, apprehension, ponderous, revulsion.

And we need to figure out this sentence:

Sweet is to sour as ... is to light.

We figured out all other examples, but this one I can not understand using the words I listed. I've checked each word in the dictionary as they are not easy to me as well.

Thanks in advance.