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it is not easy for me to get up early . an alarm clock wakes me up.yes, i do my morning exercise. i prefer a hot shower. i have porridge for breakfast. i listen to the latest news on the radio. i leave my house at 8 oclock. i work at academy. it takes  me 40 minutes to get to academy. i get there by car.

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.