Practice: Fill in the gaps with the right forms of the verbs in brackets to complete the English sentences in Present Perfect Tense. 1. They London this month. (leave) 2. He a lot of English papers. (bring) 3. She me about it. (tell) 4. I a long letter from father this week.(get) 5. She (just) ; she will speak to you in a minute.(come) .

the economic activity signified in that scenario is a. production

in general, market production makes reference to the elaboration of a product or service which is destinated for economic purposes (to be sold) at money-price in a market. such product or service has to be principally tradable for money.

there is no money exchange involved in distribution, generalized reciprocity or balanced reciprocity.

the rocket launch by showing how the population around it changes its behavior as the earth's influence over the martian planet when he uses the term "green star".

explanation: