TOEFL skills 20-23 practice

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's binary system are formed from only two symbols.

• binary system

• are

• formed

• only two

Scientists at the medical center is trying to determine if there is a relationship between saccharine and cancer.

• is trying

• to determine

• is

• sacchine and cancer

On the rim of the Kilauea volcano in the Hawaiian Islands are a hotel called the Volcano Hotel.

• the rim

• Hawaiian Isalnds

• are

• called

The great digital advances of the electronic age, such as integrated circuitry and a microcomputer, has been planted in tiny chips.

• great digital

• circuitry

• has

• planted

There are many frequently mentioned reasons why one out of four arrests involve a juvenile.

• frequently

• mentioned

• four arrests

• involve

Kepler's Laws, principles outlining planetary movement, was formulated based on observations made without a telescope.

• was

• formulated

• based

• made

Only with a two-thirds vote by both houses are the U.S. Congress able to override a presidential veto.

• two-thirds vote

• are

• able to

• veto

Of all the evidence that has piled up since Webster's paper was published, there is no new ideas to contradict his original theory.

• has piled

• is

• new

• to contradict