Поставьте предложения в вопросительную и отрицательную форму (обратите внимание на употребление Present Perfect и Past Simple)

9. 
   He has signed this agreement recently.
   
10. 
    We have agreed to purchase their machinery,
    
11. 
    They have already manufactured this equipment.
    
12. 
    I spoke to New York over the telephone yesterday.
    
13. 
    He was in the office.
    

An old scientist whom everybody in England knows very (well, good) is travelling (on, by) train. The ticket-collector (is making, makes) his round. When he comes to the scientist and asks him for his ticket, (the, an) old man begins to look (at, for) it in his pockets, in his bag and suitcase, but (cannot, may not) find it anywhere.

Economists talk about microeconomics and macroeconomics. Microeconomics deals with people, like you and me, and private businesses. It looks at the economic decisions people make every day. It examines how families manage their household budgets. Microeconomics also deals with companies - small or large - and how they run their business. Macroeconomics, on the other hand, looks at the economy of a country - and of the whole world. Any economist will tell you, though, that microeconomics and macroeconomics are closely related. All of our daily microeconomic decisions have an effect on the wider world around us.