Although the two students usually agree, their opinions on this topic ________.

We need to come up with a _____________ to fix the problem!

If the sun exploded, fire would ___________ the Earth

_____________ is referred to as the minimum velocity needed by anybody or object to be projected to overcome the gravitational pull of the planet earth.

Thinking of a way to get everyone off the planet would be an extremely ___________ task

If the sun explodes the Earth's flora, fauna and even bacteria will be __________ clean.

Building enough rockets to take everyone to space would not be __________

If an idea is more unhelpful than helpful then it is _______________. Can you tell us about something which is this?