Относительный рост концентрации химических веществ в организмах по мере продвижения по трофической цепи в экосистеме связан

1. I exercise regularly in summer but more to do in winter.
2. She usually walks slowly but now she is walking even  faster .
3. Nina speaks loudly but Mary speaks even  louder . 4. He runs
fast, ... than other boys. 5. I don’t sleep enough, less  than
8 hours. 6. He behaves badly, ... than other boys. 7. I smile
often, more than my sister. 8. Peter lives far from school,
but Ann lives closer .

Я думаю, что  4 и в 6 предложениях ничего изменять не надо. Может я ошибаюсь.

 1. more regular 2.even slower 3.even louder 4. more fast 5.less 6.worse 7.more 8.more far.