Make the questions indirect. Start with "They ask..." 1 Has anybody landed on Mars? 2 Is there life on Venus? 3 Willl people live on the Moon some day? 4 Do astronauts often visit Space Flight Control center? 5 Are there any aliens out there?
1 They ask if anybody has landed on Mars 2 They ask if there is life on Venus 3 They ask if people will live on the Moon some day 4 They ask if astronauts often visit Space Flight Control center 5 They ask if there are any aliens out there