Ubiquitous means "seeming to be everywhere at one", so a suitable sentence for ubiquitously would be:
Sugar is ubiquitously present in most of the modern-day foods eaten in westernised countries.
Like this: I did my history homework yesterday. That's how you use yesterday as an adverb in a sentence
Adverb
(You would have to use the adverb, which is tenderly.) She touched his face tenderly.
In the English language, "fire" has no adverb form.
Profoundly is a adverb.
She jumped high up into the air. The word "high" is an adverb in the sentence above.
the adverb for easily is still easily but it depends on how it is being use in a sentence.
Correctly is the adverb in that sentence.
That sentence does not have an adverb.
It is the adverb for doleful, but I do not think you should use it in a sentence
Yes, you can use an adjective and adverb in the same sentence. For example: "She quickly ran to the bus stop." In this sentence, "quickly" is the adverb describing how she ran, and "bus stop" is the adjective describing the type of stop.
The word below can be an adjective, adverb or preposition. It is an adverb in the sentence: "To see another example, look below."