Verified answer

V

take - took - taken

prove - proved - proved

become - became - become

need - needed - needed

find - found - found

set - set - set

make - made - made

come - came - come

raise - raised - raised

give - gave - given

store - stored - stored

fall - fell - fallen

pay - paid - paid

spread - spread - spread

do - did - done

VI

1 May exchange take the form of barter in the absence of some form of money?

2 Does the barter system prove very inefficient as the extent of specialization increases?

3 Must a specialist metal worker see out a large number of other specialists in order to obtain, by barter, the variety of goods he needs?

4 Is the alternative to change his skins for some other article?

5 Does the use of money make possible a great extension of the principle of specialization?

VII

Пишу только форму глагола, которую нужно вставить в предложение, и время

1 saw (Past Simple)

2 is (Present Simple)

3 тут уже есть глагол: will affect (Future Simple)

4 were (Past Simple)

5 will be (Future Simple)

6 regarded (Past Simple)