Answer:
1. The stranger turned around the corner and disappeared into the darkness.
A stranger is already anonymous, so "anonymous stranger" is redundant.
2. "The crime rate has decreased as a result of the rise in employment," the Prime Minister announced.
3. Taovala is worn as a sign of respect in a Tongan funeral.
4. The Maths question was too difficult for Ireen to answer.
5. Since the river was flooded, Pete decided not to swim across it.
6. Besided being intelligent, Nanise is well-mannered as well.
7. How about you clear the tree branch off the path?
I'm not sure if that is the type of answer this question was looking for, but this is how I interpreted it.