Rewrite the following sentences using active voice. The dinner was cooked by Ben. Karate lessons are being taken by Roberta. Cosmic rays may be released into space by gigantic stellar explosions.
Igneous rock is produced by cooling molten lava.
Increased productivity has been demanded by my supervisor. Weekly meetings are held by the professor. In the South, many poor blacks were prevented from voting by the poll tax. All the information for my report has been compiled and arranged in a logical order. A polyester gene has been inserted into a cotton plant by genetic engineers in order to grow wrinkle-free fibers.