III Choose the correct variant. 1. The mistakes … at the lesson by the teacher today. a) have been corrected b) had been

1. The mistakes have been corrected at the lesson by the teacher today. 2. I was told about it yesterday. 3. The letter had been posted by 12 o’clock yesterday. 4. The dictation was being written at this time yesterday. 5. The telegram will be received tomorrow. 6. The exercise was translated yesterday. 7. The news has been told to Mary already. 8. The lectures were attended by our students with great interest. 9. The first Russian University was founded  in 1755. 10. The guide is being listened to by the tourists now.