Creates a new HIT.
        Returns a ResultSet
        See: http://docs.amazonwebservices.com/AWSMechanicalTurkRequester/2006-10-31/ApiReference_CreateHITOperation.html

def create_hit(self, hit_type=None, question=None,
                   lifetime=datetime.timedelta(days=7),
                   max_assignments=1, 
                   title=None, description=None, keywords=None,
                   reward=None, duration=datetime.timedelta(days=7),
                   approval_delay=None, annotation=None,
                   questions=None, qualifications=None,
                   response_groups=None):
        """
        Creates a new HIT.
        Returns a ResultSet
        See: http://docs.amazonwebservices.com/AWSMechanicalTurkRequester/2006-10-31/ApiReference_CreateHITOperation.html
        """
        
        # handle single or multiple questions
        neither = question is None and questions is None
        both = question is not None and questions is not None
        if neither or both:
            raise ValueError("Must specify either question (single Question instance) or questions (list or QuestionForm instance), but not both")

        if question:
            questions = [question]
        question_param = QuestionForm(questions)
        if isinstance(question, QuestionForm):
            question_param = question
        elif isinstance(question, ExternalQuestion):
            question_param = question
        
        # Handle basic required arguments and set up params dict
        params = {'Question': question_param.get_as_xml(),
                  'LifetimeInSeconds' :
                      self.duration_as_seconds(lifetime),
                  'MaxAssignments' : max_assignments,
                  }

        # if hit type specified then add it
        # else add the additional required parameters
        if hit_type:
            params['HITTypeId'] = hit_type
        else:
            # Handle keywords
            final_keywords = MTurkConnection.get_keywords_as_string(keywords)
            
            # Handle price argument
            final_price = MTurkConnection.get_price_as_price(reward)
            
            final_duration = self.duration_as_seconds(duration)

            additional_params = dict(
                Title=title,
                Description=description,
                Keywords=final_keywords,
                AssignmentDurationInSeconds=final_duration,
                )
            additional_params.update(final_price.get_as_params('Reward'))

            if approval_delay is not None:
                d = self.duration_as_seconds(approval_delay)
                additional_params['AutoApprovalDelayInSeconds'] = d

            # add these params to the others
            params.update(additional_params)

        # add the annotation if specified
        if annotation is not None:
            params['RequesterAnnotation'] = annotation
               
        # Add the Qualifications if specified
        if qualifications is not None:
            params.update(qualifications.get_as_params())

        # Handle optional response groups argument
        if response_groups:
            self.build_list_params(params, response_groups, 'ResponseGroup')
                
        # Submit
        return self._process_request('CreateHIT', params, [('HIT', HIT),])