Fill in the blanks with suitable prepositions or articles. Put cross (x) for zero article.

Computers are used (a)__________ many ways. For example, (b)_________ computer's memory may carry the names, addresses and flight numbers of air plane passengers. (c)_________ ticket agent can find (d)_________ almost instantly, by typing (e)___________ flight number, whether there is a seat available (f)_________ a particular plane. At flight time, the computer can make a list of all the passengers (g)________ the plane. Computers can also solve many problems. (h)___________ many bits of information can be compared (i)___________ one another. Mathematical calculations can then be performed (j)__________ them.