Answer: A) I'll be back.
Explanation for this question is being written.
Answer: A) When the enemies were approaching, the soldiers prepared the city.
Answer: C) By
Answer: B) Adverb clause (AC).
Answer: A) After
Answer: A) This afternoon.
Answer: A) Had already got cold.
Answer: A) Adverbs or Adverb Groups, or Prepositional Phrases.
Answer: B) It has been two years since I started practicing my favorite hobby.
Answer: C) After
Answer: D) Frequency (how often).
Answer: A) Had been.
Answer: B) Leave
Answer: B) Return; meet.
Answer: A) If they go straight ahead.
Answer: A) Adverb clause.
Answer: B) The boy went home.
Answer: C) Time
Answer: A) Sequence
Answer: C) Adverbial clause.
Answer: D) Had already played.
Answer: A) When
Answer: B) When
Answer: B) Late
Answer: B) Adverbial clause.
Answer: B) False
Answer: B) While and When.
Answer: A) Before
Answer: C) When
Answer: A) He hugs them.
Answer: A) After a long walk.
Answer: B) Until
Answer: B) At intervals of not more than one month.
Answer: A) After he got dirty.
Answer: A) Go \ do.
Answer: B) So little time that.
Answer: B) WhileTagsgrammar
Answer: B) Tuesday
Answer: D) When
Answer: B) The day you.
Answer: B) Once
Answer: A) As soon as.
Answer: C) Dependent clause.
Answer: D) Since
Answer: D) Waited
Answer: A) See
Answer: C) Arrives
Answer: D) Duration
Answer: B) Adverb clause.
Answer: B) When she arrived in Seattle.
Answer: A) Never
Answer: C) Until
Answer: D) Between, and.
Answer: C) WHEN