Answer:
alliteration
Explanation:
the repetition of the same letter is known as alliteration. in this question the letter "t" is being repeated, hence, the figure of speech used is alliteration.
You would Gather ingredients
WW1 and WW2, these both were very impacting wars
Aside from the choice of subject, elements to consider include syntax, tone, and vocabulary. These need to be keyed to the specific audience for best effect.