to remove people's puzzles.Now that there are some 5.suitable(suit) conditions，does life really exist on this globe?

　　Do they multiply by laying eggs 6.or giving birth to babies?

　　Last month，a spaceship was sent there.It's a pity 7.that this mission failed.Unlike the earth，MKⅡ is a much 8.younger(young) planet.Thus，masses of harmful acid clouds float everywhere causing violent chain 9.reactions(react) to break out.These clouds not only blocked out the pilots' sight 10.but also damaged the engine system.Luckily，the pilots watched out carefully and prevented the spaceship from crashing in time.