1. In 1976 Sarah Caldwell became __________________ at the Metropolitan Opera House in New York City.

(A) she was the first woman to conduct
(B) the first woman conductor
(C) the woman was first conducting
(D) the woman conducts first

2. Iron (A)is one of the basic (B)element of (C)which the world (D)is made.

3. It (A)is said that no potential frontier has (B)such fired the imagination or challenged the (C)ingenuity of humankind (D)as has space.

4. Lactose, (A)sugar (B)present in milk, is one (C)of simple sugars used in (D)food) preparations for infants.

5. Located at the upper end of each _______________ an adrenal gland, an integral part of the endocrine system.

(A) kidney which is
(B) kidney is
(C) kidney being
(D) kidney