Question

(c) Sweeten (d) Brighten​

Answer 1

Answer:

become bright or brighter. transitive verb. 1 : to make bright or brighter you brightened my day. 2 : to enhance or intensify the flavor of (food) especially by adding an acidic element (such as citrus juice or vinegar) Crisp lemon slices brighten smoky bacon and rosemary-infused trout.— Melissa Roberts-Matar.

Explanation:

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Answer 2

The room was small and dark, without so much as a ray of light to brighten the gloom.

It was rainy this morning, but it brightened up (= the sun started shining) after lunch.