Write the correct tense of form of the verbs in brackets. 1. In 1947 pilot Kenneth Arnold ............. (spot) nine shiny, unidentified flying objects flying past Mount Rainier. 2. What .......... (happen) if aliens made contact with Earth? 3. He wanted to know how NASA ............. (communicate) with spacecraft. 4. Almost the same as Earth, a day on Mars .............. (have) 24 hours, 39 minutes and 35 seconds. 5. Nick said that he ......... (see) a UFO land in a grassy area the day before. 6. Captain Ray Bowyer gained clear views of two UFOs when he ............ (fly) in the English Channel. 7. So far, only two spacecraft ............. (fly) to Mercury to collect data. 8. Sue asked her teacher how long it .......... (take) to travel to Mars. 9. Neptune ............... (discover) on September 23, 1846 . 10. NASA hope they ........... (be) able to send people to Mars by 2030.