Simple present exercises

Simple present: Put the correct verbforms into the gaps.
 Dogs meat. (to like)
 Water at 100 degrees Celcius. (to boil)
 London the capital city Great Britain. (to be)
 Birds . (to fly)
 The earth around the sun. (to turn)
 London a big city. (to be)
 Computer electricity. (to use)
 Dogs . (to bark)
 London in England. (to be)