Вставьте глагол to be правильной формы:
1. There _____ several kinds of computer.
2. There _____ problems with this program yesterday.
3. There ______ special-purpose & general-purpose computers.
4. There _____ very useful data in that file.
5. ______ there many mistakes in this program?
6. There ____ no any all-purpose computing machine.

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