Incomplete Adverb Clause Exercise

Focus:  Completing structure problems involving adverb clauses, reduced adverb clauses,  and related prepositional expressions.  (Note:  Two  or three items do not focus on  one of these structures.  These items are marked in the  answer key with an asterisk.)

Directions:  Choose the one option (A), (B), (C), or (D) that correctly completes the sentences, and then mark the appropriate blank.  The first one  is done as an example.