Write whether these sentences are in the active voice (A) or passive voice (P).
Circle the door of the actions and underline the receiver of the actions in these sentences.
Complete the second sentence in each pair in the passive voice.
Change these sentences from active voice to passive voice.
Change these sentences from the passive voice to active voice.
Complete this passage using the passive forms of the verbs in brackets.
Down the ages, a great deal of interest ______1_____ (show) in asteroids by astronomers all over the world. It ______2_____ (realise) that the asteroids that are relatively closer to Earth could be dangerous to us. In 1908, a part of Siberia _____3_____ (hit) by an object that was only a few centimetres wide. As a result of this, trees for hundreds of kilometres ______4______ (destroy) completely. In fact, the noise ______5______ (hear) many kilometres away. Naturally, the search for asteroids near the Earth has become very important. The idea is that if a harmful asteroid _____6____ (discover), we could perhaps blast it or change its path, in order to avoid a collision.