Exercise 1:
an ocean
a pebble
an insect
a bug
a web
an archaeologist
an eagle
a geologist
a fossil
an ancient fossil
You only change "a" to "an" when the next word starts with a vowel.
The answer is B, an.
The answers for 2 and 3 are A then C.
Binsey Poplars is full of unusual language, internal rhyme, alliteration, assonance, sprung rhythm and repetition. Hopkins developed his own unique sprung rhythm, based on a much older metric tradition with roots in Greek song and Welsh poetry.
A-Progressive tense Example: I bike everyday. "I am biking today."