Complete the head chef's performance review of his well-meaning but chaotic new assistant by choosing the correct expression for each gap.

I explained the complicated recipe to him in detail, specifically asking him to keep an eye on the simmering sauce, and although he is a decent cook on the whole, he still managed to burn the garlic!

I explained the complicated recipe to him in detail, specifically asking him to keep an eye on the simmering sauce, and although he is a decent cook on the whole, he still managed to burn the garlic!

in detail: When we explain something thoroughly, the phrase takes no article (zero article).

keep an eye on: This idiom, meaning "to watch carefully," requires the indefinite article "an".

on the whole: This fixed phrase, meaning "generally speaking," requires the definite article "the".