4. I made new friends last summer. 5. Do you always spend your holidays in country? 6. What's news? 7. Do you speak German? – Yes, I do. German language is difficult. 8. Is German most difficult language? 9. Do they study French or German? 10. We have English on Wednesday.

Explanation: The sentences in this section are complete and do not require articles or specific prepositions to be filled in. The task seems to be to identify and potentially correct errors, but as presented, these sentences are grammatically sound for their intended purpose in an exercise.

Answer:

• 4. I made new friends last summer.
• 5. Do you always spend your holidays in the country?
• 6. What's the news?
• 7. Do you speak German? – Yes, I do. The German language is difficult.
• 8. Is German the most difficult language?
• 9. Do they study French or German?
• 10. We have English on Wednesdays.