Circle the correct answer.
The very first computers 'invented/were invented about 2500 years ago.
Simple machines called abacuses "made/were made by the ancient Egyptians.
These machines 'used/ were used for thousands of years. A computer
"invented / was invented nearly 500 years ago by Blaize Pascal but it only
added / was added numbers. Alan Turing "made/was made a different
machine 80 years ago. It' did / was done more than any person could do.
Then about thirty years ago, the first personal computers 'sold/were sold.
Now, of course, they were bought/ are bought all over the world.