Ex. 39. Fill in the gaps with prepositions if necessary.

1. Today computers can translate ___ and ___ foreign languages.

2. They operate ___ a great speed.

3. Computers process a large volume ___ data ___ a short period ___ time.

4. Thanks to the Internet, people can work, shop and bank ___ home.

5. A modern computer can do 500,000 sums ___ second.

6. In schools, pupils learn how to operate ___ a computer.

7. Data can be input into the computer ___ floppy disks or compact disks.

8. Computer keyboards are similar ___ typewriter keyboards.

9. The speed ___ this computer translation is one page ___ 40 seconds.

10. Every time I tried to feed the data ___ the computer, it gave me an error message.