Among bees ____ a highly elaborate form of communication.

• occur

• occurs

• it occurs

• they occur

____ heated by solar energy have special collectors on the roofs to trap sunlight.

• A home is

• Homes are

• A home

• Homes

Each number of binary^(A) system are^(B) formed^(C) from only two^(D) symbols.

• A

• B

• C

• D

Scientists at the medical center is trying^(A) to determine^(B) if there is^(C) a relationship between saccharine and cancer^(D).

• A

• B

• C

• D

On the rim^(A) of the Kilauea volcano in the Hawaiian Islands^(B) are^(C) a hotel called^(D) the Volcano Hotel.

• A

• B

• C

• D

The great digital^(A) advances of the electronic age, such as integrated circuitry^(B) and a a microcomputer, has^(C) been planted^(D) in tiny chips.

• A

• B

• C

• D

There are many frequently^(A) mentioned^(B) reasons why one out of four arrests^(C) involve^(D) a juvenile.

• A

• B

• C

• D

Kepler's Laws, principles outlining planetary movement, was^(A) formulated^(B) based^(C) on observations made^(D) without a telescope.

• A

• B

• C

• D

Only with a two-thirds vote^(A) by both houses are^(B) the U.S. Congress able to^(C) override a presidential veto^(D).

• A

• B

• C

• D

Of all the evidence that has piled^(A) up since Webster's paper was published, there is^(B) no new^(C) ideas to contradict^(D) his original theory.

• A

• B

• C

• D