阅读下面短文，在空白处填人1个适当的单词或括号内单词的正确形式。
There are lots of places in the universe people would like to explore.They want to go to Mars or Saturn’s moonTitan,and see if they could 61 (exact )hold signs of life.
But while some of these places might hold new forms of life,they aren’t very good at 62 hold humans.People may soon travel to the Moon or Mars,but they will need to bring everything with them,from food to their ownoaygen;besides,the jourmeys 63 be)long,dangerous and expensive for them.Therefore,in many cases,it’suuch 64 easy)to send a robot.
Space 65 explore)by robot still isn’t cheap or easy.These robots cost billions of dollars,and sometimes theybreak.But robots have many advantages 66 humans.For instance,they don’t require food,water or oxygen.Androbots can be very handy space explorers.They can take 67 sample)and help scientists find out if a planet’ssurface could host life.Other robots use lasers 68 (search)below the surface of Mars to find out 69 they aremade of and if there are quakes.And they can send back pictures,giving us 70 glimpse of places most of us willnever go.
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