[.что было, есть и будет]

Здравствуйте, помогите пожалуйста с заданием, срочно нужно. Или хотя бы подскажите, где найти правила в удобоваримом виде.
XII. Insert a, an or the if necessary:
1. I ate ... sandwich and ... apple yesterday. 2. My sister is ... doctor.
3. It is ... very difficult question. 4. Ukraine is ... agricultural country. 5. It is ... rainy day today. 6. I had ... shower this morning. 7. They are ... friends.
8. We often go to ... cinema. 9. Who invented ... telephone? 10. I have ... hour and ... half for ... lunch. 11. I have ... headache and ... sore throat.
I think I’ve got ... cold. 12. What ... strange man! 13. Do you play ... guitar?

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[буду.]

XII. Insert a, an or the if necessary:
1. I ate а sandwich and аn apple yesterday. 2. My sister is a doctor.
3. It is a very difficult question. 4. Ukraine is an agricultural country. 5. It is a rainy day today. 6. I had a shower this morning. 7. They are _ friends.
8. We often go to the cinema. 9. Who invented the telephone? 10. I have an hour and a half for__ lunch. 11. I have a headache and a sore throat.
I think I’ve got a cold. 12. What a strange man! 13. Do you play the guitar?