ответьте на вопрос, используя слово "already" в present perfect shall i buy some newspapers?

No, Peter  has already bought some. 

Guy Fawkes Day. November 5th is Guy Fawkes Day in Britain. All over the country people build wood fires, or "bonfires" in their gardens. On top of each bonfire is a guy. That is a figure of Guy Fawkes. He was one of a band of conspirators who wanted to blow up the Houses of Parliament and kill King James I and his ministers. However, the plot failed, Fawkes was caught on the 5th of November 1605. The conspirators were executed and Britain has celebrated Guy Fawkes night then. Before November 5th, children use their guys to make money. They stand in the street and shout "Penny for the guy". Then spend the money on fireworks.

1He suggested a visit to the museum.
2She suggested a compromise to them.
3I suggested that we go to the cinema tonight.
4  Can you suggest a better plan?
5 I suggest that you shouldn't take the job.
6They suggested camping out near a river.
7 I suggest we should go on a picnic.
8Can you suggest a good school near by?
9I suggest you go to Moscow with Boris.
10 I never suggested that.

1Who can prevent it?
2Careful driving prevents accidents.
3The refrigerator prevents food from going bad.
4Vitamin C helps to prevent colds.
5He prevented a war on the Earth.