Fill in 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.

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