A subordinate clause may be introduced by a relative pronoun or a subordinate conjunction
"During the rock concert" would be the subject, as "an amplifier exploded on stage" would be the predicate.
nope u should use your notes to help get your answer
C
"The dog turned up..." means it showed up, was returned etc. Etc. The details of how the dog turned up are not important..what is..is that your dog is home.