Read the text. Fill in the gap with the missing part of the sentence.
One part is extra.
The race is on as to which country will be the first to inhabit the Moon. Apart from the United States, Russia and recently India; now China, Japan and Europe plan on sending astronauts to the Moon in the next 20 years. So, a station on the Moon might soon be possible! _____________ The most obvious include the questions of power, water, air and shelter.

• Yet, we must face the fact that before this can happen we have a few problems to deal with.
• Just think, 400,000 dollars is needed to send an object that weighs around four kilos to the Moon.
• All the same, we have not found any evidence that the Moon has water.
• Perhaps the human race may be able to live on Mars in the future!
• With this information they will be able to finally know if there is water on the Moon.
• Moreover, the poles see much more sunlight, which can be used for solar energy.
• If this is the case, astronauts can use solar energy to melt the ice into water.