Sincecomputerswerefirstintroducedtothepublicintheearly1980s,technologyhas1:[]agreatdeal.Thefirstcomputers2:[]simplemachines.Theyweredesignedforbasictasks.Theydidn'thave3:[]memoryandtheywerenotverypowerful.Earlyc

Question

Since computers were first introduced to the public in the early 1980s,technology has 1:[ ] a great deal.The first computers2:[ ] simple machines.They were designed for basic tasks.They didn't have 3:[ ] memory and they were not very powerful.Early computers were often quite expensive and customers often4:[ ] thousands of dollars for machines which actually did very little.Most comquters 5:[ ]used mostly as expensive typewriters or for playing games.
1处可选词：change changed changes
2处可选词：are were have been
3处可选词：much high little
4处可选词：payed pay paid
5处可选词：were are be

Answer 1

1,changed,has +done是现在完成时结构
2,were,一般过去时
3,much,修饰memory
4,paid,花费（pay）的过去式
5,were,被动语态的一般过去时