Answer: D) The more efficiently/the higher.
Explanation for this question is being written.
Answer: A) Quickest
Answer: A) Cloudier than.
Answer: A) More dangerous.
Answer: A) Bigger
Answer: A) Better
Answer: B) He is the most careful in my team.
Answer: A) More useful than.
Answer: B) More beautiful / more expensive.
Answer: A) Faster
Answer: A) Comparative: shyer / more shy; Superlative: shyest / most shy.
Answer: A) More intelligent.
Answer: C) More
Answer: C) More loudly than.
Answer: C) Use the word 'more' in front of the adjective.
Answer: A) More energetic.
Answer: D) Younger
Answer: B) More and more difficult.
Answer: B) More interesting.
Answer: C) Much
Answer: A) More exciting than.
Answer: B) Less
Answer: B) Not very.
Answer: A) Closer
Answer: C) Hotter
Answer: B) More delicious.
Answer: C) More friendly, friendliest.
Answer: D) More, longer.
Answer: D) More confidently.
Answer: C) Good enough.
Answer: A) Friendlier
Answer: A) Comparative: messier, Superlative: messiest.
Answer: B) More exciting.
Answer: A) Fewer
Answer: A) More important.
Answer: C) More talkative.
Answer: C) With 2+ syllable superlative adjectives.
Answer: B) Than
Answer: D) Ask, beg, implore.
Answer: A) Stronger
Answer: A) More comfortable.
Answer: A) Less
Answer: B) More expensive.
Answer: D) Peter's exam results are worse than Nick's exam results.
Answer: C) Smarter
Answer: C) More, them.
Answer: A) Slightly
Answer: A) Less densely populated.
Answer: B) Better-than
Answer: A) The most complex.
Answer: A) Est
Answer: B) More difficult.
Answer: B) He is tall enough to play basketball.
Answer: C) More and more interesting.
Answer: B) Bigger
Answer: B) More interesting than.
Answer: C) More beautiful.
Answer: A) Cold-colder-the coldest.
Answer: C) Er and est.