3. I didn’t know enough about the machine so I couldn’t mend it by myself. If
4. The house doesn’t burn down because the fire bridgade comes immediately.
 If
5. Hung wasn’t careful, so he lost his money.  If
6. I didn’t know Alice’s address. Therefore, I couldn’t write to her.
 If
7. “ If the weather is fine, I will go on a picnic with my friends,” she said to me.
She told

its everything except for telling nonfiction and using first person

- the mistakes that have been done in the past will repeat themselves

- you will trust all the wrong people

i believe the answer is: b. mr. head had a long, tube-like face with a rounded open jaw and a short depressed nose.

this is because in the un-revised sentence it said that mr. heads face was long and tube-like, and he had a rounded open jaw. this is not a very grammatically correct because of how it seems to drag on with the and, replaced with, with, makes it sound more fluent in the description.