Solar energy is collected by large panels to produce electricity., The printing press was invented by Johannes Gutenberg in 1440., Endangered species are being monitored by scientists using satellite tags., Ancient ruins were being excavated by archaeologists during the last century., Many great cities have been built along the banks of rivers., The stars had been observed by ancient astronomers long before telescopes., New medicines will be tested by experts to ensure public safety., The old space station will have been retired by the year 2030., All safety rules must be followed by students in the laboratory., English is spoken as a first language by millions of people.

Passive (1): Input Form

by
Print
Embed

Leaderboard

Visual style

Options

Switch template

Continue editing: ?