1. Why is Andy tired? 2. What happened to most of Britain s old colonies by 1960? 3. When did David break his leg?

1. Andy is tired because he had a long and busy day. He might have been engaging in physical activities, studying for exams, or working hard on various tasks or projects. Sometimes, when we exert a lot of energy or effort, it can lead to tiredness and fatigue.

2. By 1960, most of Britain"s old colonies had gained their independence. After World War II, many countries in Africa and Asia began to seek independence from their European colonizers. Through peaceful negotiations or armed struggle, these colonies achieved their freedom and formed independent nations.

3. David broke his leg last week while playing sports. He was involved in a game or physical activity when he had an accident and suffered a fracture in his leg.

4. He was working six days a week. From Monday to Saturday, he dedicated his time to work. This means he had only one day off each week.

5. Unfortunately, I cannot answer personal questions about my previous holidays as I am an AI and do not have personal experiences.

6. He has been working at his computer for three hours. He started working on his computer three hours ago, and he is still continuing his work at present.

7. She has finished her homework for two hours. Since there is a mismatch between the given information and proper grammar usage, it is unclear whether she has finished her homework or not. Please provide more context or rephrase the question.

8. The number of people cannot be determined based on the given information. To know the exact number of people, we need more specific details.

9. Without additional information, it is impossible to determine what they did. Please provide more context or specify the subject or event related to "they" in order to provide a proper answer.

10. I am an AI, so I do not feel physical sensations or emotions. Thank you for asking, but I am here to assist you with any academic-related questions.

11. I cannot answer personal questions about the whereabouts of individuals named Tom and Sam as I do not have that information.

12. The time or date when Tom and Sam left was not provided. Please clarify the time frame so that I can give a more accurate answer.

13. The specific activity that Tom and Sam are doing was not mentioned. Please provide more context or specify the subject or event so that I can provide a proper response.

14. The information about where she works was not provided. Please provide more details or context about the person in question.

15. Without additional context, it is difficult to determine what "it" refers to. Please provide more specific information so that I can give a more accurate answer.

16. The current activity of Janet was not mentioned. Please provide more context or specify the subject or event so that I can provide a proper response.

17. The identity of Nelly was not provided. Please provide more context or specify who Nelly is so that I can provide a proper response.

18. While she was cooking, she might have been doing other activities simultaneously. Please provide more context or specify the subject or event related to "she" and her actions during cooking.