Откройте скобки и поставьте правильную форму participle i
1. when ….. (to seek) an explanation, we sometimes find more than one explanation.
2. ….. (to appoint) the head of the laboratory he went on his researches on the behavior of the particles (to influence) by the magnetic field.
3. for reproduction ….. (to fluctuate) voltages induced in a coil wounded on the magnet.
4. he was ….. (to work) at his scientific paper when i rang him up.
5. the substances to be separated have similar chemical and physical properties, ….. (to include) the manner in which they partition between two phases.

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