7) q: a: which sentence does not contain a subordinate clause? a)the kitten played excitedly with the ball of yarn. b)while i was watching a movie last night, i heard a strange noise outside my window. c)ben spent the evening playing video games even though he had two tests the next day. d)michael decided to stay home last night because his mother brought home a stray kitten.

The correct answer is:  

[A]:  "The kitten played excitedly with the ball of yarn." 

Note the following:

Choice [B]:  "While I was watching a movie last night, I heard a strange noise outside my window."  is INCORRECT.  This sentence contains the following subordinate clause:  "While I was watching a movie last night" .

 Choice [C]:  "Ben spent the evening playing video games even though he had two tests the next day."  is INCORRECT.  This sentence contains the following subordinate clause:  "even though he had two tests the next day" .

 Choice [D]:   "Michael decided to stay home last night because his mother brought home a stray kitten."  is INCORRECT.  This sentence contains the following subordinate clause:  "because his mother brought home a stray kitten" . 

The correct answer is b