Complete the sentences with the words below.

Write one word in each gap.

shuttle, fuel, underwater, housemaid

There are a lot of films that show [ ] cities in the future.

I hope I will have a robotic [ ] in 2050. It will clean my house.

The development of the moon [ ] is an important step in establishing a human presence on the Moon.

The car's [ ] tank was almost empty, so we had to stop at the gas station to fill it up.