Thank you very much. I still have a few questions.

1) Your sentences are confused and sometimes disconnected. Check the spelling in the dictionary before writing a word and make sure you are using tenses correctly.
2) White people failed (their mission) because they didn’t bring civilization to Africa but only slavery and violence.
3)they failed their mission of bringing civilization to Africa because they used violence and enslaved the natives.
4) Can you tell me which alternatives are possible?:
work shifts / do shifts (?)
work overtime/do overtime ?
to be on the dole/to live on the dole (the dole is the unemployment benefit)
ill-mannered, rude, bad mannered (??)
to top up one's mobile phone
to recharge/load a mobile phone
to subscribe to a telephone company

(1) - (3) are not questions.

(2) and (3) are two ways of saying the same thing. The statements do not necessarily apply to all African countries or colonial powers.

To work overtime (or a shift) is preferred over to do overtime (or a shift).
"To be on the dole" is more commonly used. It is an expression more commonly used in Great Britain and Ireland than the USA.
Mobile phones get recharged.
"Subscribe to a telephone company" or "be a subscriber of___"
"have___ as a service provider" are all correct usage.

The only things I would add to DrWLS's response are these.

1. comma needed after "word"

3. Capital T on the first word

1) As an AI bot, I do my best to generate coherent and connected sentences. However, I apologize if there are occasional errors or issues. I don't have direct access to a dictionary, but I can help with spelling and grammar if you have specific questions or need clarification on certain words or topics.

2) The sentence "White people failed because they didn’t bring civilization to Africa but only slavery and violence" is a statement expressing a viewpoint on history. It suggests that the intended goal of bringing civilization to Africa was not achieved, and instead, slavery and violence were brought. It's important to recognize that history is complex and varied, and generalizing the actions and motives of an entire race can be misleading or inaccurate.

3) The sentence "They failed their mission of bringing civilization to Africa because they used violence and enslaved the natives" conveys a similar idea but specifies that the failure was due to the use of violence and enslavement. Again, it's important to approach historical discussions with nuance and acknowledge that not all individuals or groups acted the same way in history.

4) Here are the possible alternatives for the given phrases:

- Work shifts / Do shifts: Both phrases are commonly used and interchangeable to describe the act of working in shifts.
- Work overtime / Do overtime: Both phrases are also commonly used and interchangeable to describe working additional hours beyond the regular working schedule.
- To be on the dole / To live on the dole: Both phrases refer to relying on unemployment benefits. "To be on the dole" is more commonly used in British English, while "to live on the dole" might be more common in American English.
- Ill-mannered / Rude / Bad-mannered: These words all describe someone who lacks good manners. All three alternatives are acceptable and convey a similar meaning.
- To top up one's mobile phone / To recharge/load a mobile phone: Both phrases are used to describe the act of adding credit or minutes to a mobile phone plan. They are typically interchangeable.
- To subscribe to a telephone company: This phrase is commonly used to describe the act of signing up for a telephone service or plan. It indicates a commitment to use the services provided by the company.