Fill in the verbs using them in the appropriate form.

Fill in the verbs using them in the appropriate form.
1nbsp; nbsp; In the twentieth century, scientists ... extracts of ancient plants in floating masses of
2nbsp; nbsp; When travelling by car, be very attentive and ... dangerous driving.
3nbsp; nbsp; Since the passengers were in danger, the rescue party used a helicopter to get to the place where two ships ....
4nbsp; nbsp; The captain of the submarine ordered the crew to stop the engines to ... a collision with a strange unidentified object moving towards them under the water
5nbsp; nbsp; An expedition of specially-trained divers have kept trying to find the ship that... more than half a century ago.
6nbsp; nbsp; An unexpected storm seriously ... the ship. Thats why the captain ordered them to stop in the nearest port to repair it.
7nbsp; nbsp; This shipbuilding company has a long and successful history. They ... one or two liners every year.

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