Transportation crossword #3 (level 3)

Across

4. 4 It takes sick people to the hospital. (9 letters)
7. 7 Two wheels with an engine. (10 letters)
10. 10 Boat that travels underwater. (9 letters)
11. 11 Shoes with wheels. (6 letters)
12. 12 You push with one foot to move. (7 letters)

Down

1. 1 Four wheels on the road. (3 letters)
2. 2 It flies in the sky. (5 letters)
3. 3 It flies with a big rotor. (10 letters)
5. 5 Two wheels and pedals. (4 letters)
6. 6 It runs on rails through the city. (4 letters)
8. 8 Big vehicle that carries goods. (5 letters)
9. 9 It goes into space. (6 letters)