Not until ________.
A.I approached the flat that I realized that it was completely empty.
B.did I approach the flat that I realized that it was completely empty.
C.I approached the flat did I realize that it was completely empty.
D.did I approach the flat I realized that it was completely empty.

The purpose of the expedition of 1776 was__________
A.to look for a way to reach California.
B.to study the archaeology of the region.
C.to look for silver in the mountains.
D.to build the towns of Durango and Dolores.

Why does the author mention "gold, pelts, and slaves" in paragraph 2 ?
A.To classify the natural resources.
B.To criticize the cruelty of the Spanish.
C.To point out the wealth of the region.
D.To show commercial interest in the region.

What does the passage mainly discuss?
A.The Spanish influence in Colorado.
B.The history of the Anasazi in Colorado.
C.Early exploration of Colorado.
D.Economic exploitation of Colorado.

Never/history/humanity/there/be/more people/live/world.
A.Never in the history of humanity there are more people living in this world.
B.Never in the history of humanity has there been more people to live in this world.
C.Never in the history of humanity are there more people living in this world.
D.Never in the history of humanity have there been more people living in this world

plants/animals/survive/ oxygen.
A.Neither plants nor animals can survive having oxygen.
B.Neither plants or animals can survive without oxygen.
C.Neither plants nor animals can survive without oxygen.
D.Not plants nor animals can survive with no oxygen.

Tennis wear has become a very lucrative business for both manufacturers and tennis stars.
A.illegal
B.expansive
C.circumstantial
D.profitable

The pilot miraculously survived the crash unscathed.
A.unsurprised
B.unhurt
C.unhappy
D.undeterred

The word "retrieved" in paragraph 4 is closest in meaning to__________.
A.bought
B.interrupted
C.recovered
D.forgotten

It can be inferred that short-term memory is called "working" memory because________.
A.we use it extensively when we are working.
B.it holds information we are working on at a given moment.
C.it is very difficult to use effectively.
D.we must work hard to retrieve information from it.