Сгерундием put the verbs in brackets into –ing form or infinitive (with or without to) he avoids (travel) by plane because of his phobia. what you can (do) is just not to mind your business. let’s spend our weekend ) downtown. mark has decided (become) a lawyer as his father. don’t let him (eat) ice cream or he will get a sore throat.

Traveling, do, shopping, to become, eat

Money is any object or record that is generally accepted as payment for goods and services and repayment of debts in a given country or socio-economic context. 
is accepted as payment - present simple, passive voice

However, this has not always been true.
has not been true - present perfect, passive voice

In primitive societies a system of barter was used.
was used - past simple, passive voice

Cattle, grain, teeth, shells, feather, salt, tobacco have been used.
have been used - present perfect, passive voice

The main functions of money are distinguished as: a medium of exchange; a unit of account; a store of value; and, occasionally in the past, a standard of deferred payment.
are distinguished as - present simple, passive voice

When money is used to intermediate the exchange of goods and services, it is performing a function as a medium of exchange.
is used to - present simple, passive voice

To act as a store of value, money must be able to be reliably saved, stored, and retrieved – and be predictably usable as a medium of exchange when it is retrieved.
is retrieved - present simple, passive voice

Houses, office buildings, land, works of art, and many other commodities are regarded as a means of storing wealth and value.
are regarded - present simple, passive voice

These payments will be made using money, because money acts as a store of value.
will be made - future simple, passive voice

1.doesn't.2.doesn't come,come. 3.come. 4.studies, plays. 5.don't know, say. 6.don't. 7.doesn't go, makes. 8.go, goes. 9.does. 10.don't eat, eat. 1.do you 2.does he play. 3.do they come from. 4.it costs. 5.do they work. 6.does she watch.1.No, she doesn't. She lives in Buckingham Palace. 2.No, it doesn't. It boils at 100 degrees Celsius. 3.No, it doesn't rice in Spain. It rices in Japan. 4.No, it doesn't. It comes before summer. 5.No, they don't. They speak Portuguese. 6.No, they don't. They play with oval ball.