Fill in the gaps in the following sentences using the appropriate form of the verb in brackets

1) Microsoft... (found) by Bill Gates. 2) Computer language... (develop) in the 1970s. 3) During that period enormous advances... (make) in computer technology. 4) The following year, twice as many personal computers... (sell). 5) The first digital computer... (build) by the University of Pennsylvania in 1946. 6) Last year more software companies... (launch) than ever before. 7) Intel (release) the first microprocessor. 8) They (perform) many data processing operations in nanoseconds, which (to be) billionths of seconds. 9) Fourth generation computers (become) smaller as more components (squeeze) onto microchips.

Put the verbs in brackets in an appropriate tense form.

Computers, as we know them today, (to appear) comparatively recently. Only in the mid-1940s the first working digital computer (to complete). Then computers (to evolve) tremendously. Vacuum tubes used in the first-generation computer (to replace) by transistors in the second-generation computer at the beginning of the early1960s. By the end of the 1960s, transistors themselves (to replace) by tiny integrated circuit boards and a new generation of computers (to be) on the market. Fourth-generation computers (to be) now produced with circuits that (to be) much smaller than before and can be on a single chip. Even today, new technologies (to develop) to make even better machines.