Choose the word (A, B, C or D) that best fits each space in the following passage.

Good evening. Welcome to our Fun Science Program. This week we have received a lot of questions about life on the moon. We have talked to some experts and these are what we have (17)_________ out. There is no water or air on the moon. It is all silent (18) _________ there is no air. Of course there will be no music, no sounds. There goes down to 151°C below zero. But during the are no rivers and no lakes. At night it is very cold. The (19) _________ day it rises to 100°C above zero.

There are great round holes on the moon. They are called craters. There are more than 30,000 of them. There are also high mountains. The (20) _________ mountains on the moon are about 26,000 feet or 8,000 meters. And here is something very interesting for you (21) _________: on the moon you weigh one sixth of what you weigh on the earth. If you weigh 50 kilos, on the moon you will weigh only a little more than 8 kilos. You will be able higher than any high jump Olympic champions. You can take very long steps as to jump very high, (22) _________ well. And ... Maybe you won't sleep very well because one day on the moon lasts two weeks. So, is there life on the moon? I'll leave the question for you to answer yourselves in the group discussion.

We have talked to some experts and these are what we have (17)_________ out.