Combine these pairs of sentences as in the example. example: the services are useful. the workers provide the services. => the services which the workers provide are useful/ a. the goods are essential. they need the goods. b. the schools and hospitals are essential. the provide the schools and hospitals. c. the goods are valuable. he buys the goods. d. the money buys essential commodities. people earn this money. e. the goods and services are very useful. people produce these goods and services. f. the work is called economic activity. we do this work. g. the work provide them with money. people do this work. h. the economic activities make up the economic system. people undertake these economic activites.

a. The goods which they need are essential.  

b. The schools and hospitals which they provide are essential.  

c. The goods which he buys are valuable. 

d. The money which people earn buys essential commodities. 

e. The goods and services which people produce are very useful.  

f. The work which is we do called economic activity.  

g. The work which people do provide them with money. 

h. The economic activities which people undertake make up the economic system.  

a. The goods which they need are essential

b. The school and hospitals they provide are essential

c. the goods which he buys are valuable

d. The money which people earn buys essential commodities

e. The goods and services which people produce are very useful

f. the work which we do is called economic activity

g. the work which people do provide them with money

h. The economi activities which people undertake make up the economic system