a) accountant, company, meeting, friendly

b) computer, payment, modify, ticket

c) apartment, competitor, passenger, advertisement.

d) airport, textbook, through, pizza

a) walk, affect, sale, organize

b) imply, run, apologize, encourage

c) understand, refuse, advice, reject

d) every choice is correct

a) construct

b) constructive

c) construction

d) constructiveness

a) economy

b) economize

c) economically

d) economical