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to __________ (make or design something for the first time) a robot that needs no energy. absent invent 3. I find it difficult to __________ (choose as the best or most suitable) a man to be their leader. 4. Why the man has been arrested is __________ (not known) to us. select unknown 5. He is asked to __________(get back) home before it gets dark every day. 6. He is certainly able to win first __________ (something of value given to somebody who is successful) in the petition. return prize 7. Marie Curie made a great contribution to the history of __________ (all human race, both men and women). 8. The missi