Look at the following picture carefully.
Now read the following paragraph carefully and fill the blank with correct sequence of words.
A stone suspended with a non-stretchable thread makes a simple ________. When the pendulum is at rest, it is at position B. This is called the rest position or its ________. When it swings, it moves from B to A, back to B, from B to C and back to B. This completes one full swing of the pendulum. Each swing is called __________.