In the following passage, some words have been deleted. Read the passage carefully and select the most appropriate option to fill in each blank.

Cancer is a disease in which some of the body’s cells grow (1)_______ and spread to other parts of the body. Cancer can start (2)______ anywhere in the human body, which is made up of trillions of cells. Normally, human cells grow and multiply (through a process called cell division) to (3)______ new cells as the body needs them. When cells grow old or become damaged, they die, and new cells take their place. Sometimes, this orderly process (4)______ down, and abnormal or damaged cells grow and multiply when they shouldn’t. These cells may form tumours, which are lumps of tissue. Tumours can be cancerous or (5)_______.