Преобразуйте пассивные предложения в активные и запишите их.
1. The first rubber balloons were made by Michael Faraday in 1824.
2. The toy balloons were introduced by a pioneer rubber manufacturer Thomas Hancock.
3. The piano was developed from the harpsichord by Bartolomeo Cristofori of Pauda.
4. Graphite, first was discovered by an unknown person about 1564.
5. The Barbie doll was intented by Ruth Handler.
6. The fisrt microwave oven was developed by Percy Spencer.

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