Tweaked wording on survey questions that seemed to be for students about to take the course.

djangoapps/student/survey_questions.py

@@ -149,7 +149,7 @@ exit_survey_questions = {
         
         {'type' : 'select_many',
         'question_name' : 'why_course',
-        'label' : 'Why are you taking this course? (Check all that apply.)',
+        'label' : 'Why did you take this course? (Check all that apply.)',
         'choices' : [
             'Interest in topic',
             'Preparation for advanced standing exam',
@@ -165,7 +165,7 @@ exit_survey_questions = {
         
         {'type' : 'radio',
         'question_name' : 'internet_access',
-        'label' : 'Where do you access the MITx website most frequently?',
+        'label' : 'Where did you access the MITx website most frequently?',
         'choices' : [
             'At home',
             'At the home of a friend or family member outside your home',