IV. Read the following passage and choose the best answer for each blank.

Puberty is the time when your body grows from a child's to an adult's. You will know that you are going (26) ________ puberty by the way that your body changes.

If you are a boy, your shoulders will (27) ________ and your body will become more muscular. These changes are caused by the hormones (28) _______  your body begins producing in much larger amounts (29) ________  before.

Puberty (30) _______ over a number of years, and the age at which it starts and ends varies (31) _____. It generally begins somewhere between the ages of 7 and 13 for girls, and somewhere between the ages of 9 and 15 for boys, although it can be earlier or later for some people. This wide (32) ________  in age is normal.

Sometimes, (33) ________, people pass this normal age range for puberty (34) _____ showing any signs of body changes. This is (35) _____ delayed puberty.

….and the age at which it starts and ends varies (31) _____.