Here are the corrected sentences with mistakes underlined:

1. **Emma has washed** the dishes after dinner.
(Correction: "has washed" instead of "washed")

2. Oh my god, I put too much **salt** into the soup.
(Correction: "salt" instead of "salts")

3. My teacher was angry because some students did not do their **homework**.
(Correction: "homework" instead of "homeworks")

4. It is very dangerous to play with **knives**.
(Correction: "knives" instead of "knifes")

5. It took me around five to six **hours** to finish my job.
(Correction: "hours" instead of "hour")

6. My **daughter** likes cheese very much.
(Correction: "daughter" instead of "daughtrer," and "a cheese" is omitted)

7. I asked my professor for **advice** on my career.
(Correction: "advice" instead of "a advice")

8. On my way to the countryside, I saw some **buffaloes**.
(Correction: "buffaloes" instead of "buffalo")

9. There is only a few **buses** on the road today.
(Correction: "buses" instead of "bus")

10. Mr. John has three **children**, two boys and one girl.
(Correction: "children" instead of "child")