VI. Fill in the correct preposition.

25. A lot of doctors were called to help people after the air crash. 26. Call over sometime and we’ll watch the new DVD together. 27. The meeting was called off; we still don’t know why. 28. A nurse often calls on my granny because she is not well. 29. The tsunami in Indonesia called for immediate action. 30. Relax; we are out of danger.