21) Phosphorus is used in paints for highway signs and markers because it is bright at night.
22) The Supreme Court has a reputation for being just.
23) To look quickly through a book is an important study skill.
24) Einstein's theory of relativity seemed incredible at the time that he first introduced it.
25) the perpetual motion of the earth as it turns on its axis creates the change of seasons.
26) The development of general anesthetics has allowed doctors to operate without the pain once associated with surgery.
27) In the past, energy sources were thought to be boundless.
(A) without limits
28) Library cards will expire when they are not used.
(A) cost more money
(B) cease to be effective
(C) be mailed to the holder's address
(D) be continued automatically
29) Because of a long drought, farmers are doubtful about the prospect of a good yield.
30) A compound break is more serious than a simple one because there is more opportunity for loss of blood and infection.