Answer:
Mrs. Auld taught Douglass basic cooking skills. Mr. Auld thought this was a terrible idea.
Step-by-step explanation:
There are several combinations that would work here.
For the first blank: You just need to pick a word that ends in ing. Cooking and working would both work here but I'd go with cooking because working isn't very specific. Working is such a broad term that it probably wouldn't be used.
For the second blank: You need to pick an option that has a/an in front of it. A good, a terrible, and an interesting would all work here.