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1. Scientists say that forests are being destroyed by air pollution.
Scientists blame . 

2. Mr. Marks, whose farm the stream flows across, is unhappy about the plans for the new dam.
Mr. Marks, across . 

3. I assure you that David is a man. You can absolutely depend on him.
I assure you that David is a man on . 

4. The person is sitting at the desk. You should talk to her about your problem
The person . 

5. I couldn′t understand the woman. I talked to her on the phone.
I couldn′t understand the woman .