Reported speech問題

2. Dr Brown said (that) he always told his students he did not have a define answer.

3. Dr Brown said (that) most people felt very sleepy if they stayed awake for more than 24 hours.

4. Dr Brown said (that) although he did not know why we needed to sleep, he had lots of suggestions of us on how to get a good night's sleep.

5. Dr Brown said (that) one way was to read before we went to bed.

6. Dr Brown said (that) his daughter often used that method whenever she failed to sleep.

7.Dr Brown said (that) if we were not able to sleep that night, I should try that method and see if it worked.