Complete these sentences with the correct forms of the verbs in brackets 1) in the 15th century, leonardo dicaprio wanted

1. In the 15th century, Leonardo da Vinci wanted to build a helicopter but he couldn\'t seriously consider doing so because the technology didn\'t exist. 2. Although H.G. Wells could imagine travelling to the moon, he failed to understand how it could be done. For example, he seemed to think it would be possible without special breathing systems. 3. Arthur Clarke enjoys thinking about space adventures but he avoids writing about things without explaining how they might be possible one day. 4. Would you agree to postpone going back to school if you could travel to the moon?