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Just as sound travels through the air in waves, electricity travels through the air in ______ radio waves.

A．what is called

B．which is called

C．what it is called

D．which it is called

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Busy and successful as he was, the novelist was willing to _____ any promising young man and give him all the help he could.

A．take up

B．pick up

C．make up

D．look up

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When there's doubt the examiner's decision is _____.

A．right

B．final

C．definite

D．fixed

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After dinner the minister made a short _____ to the guests.

A．delivery

B．pronunciation

C．conversation

D．speech

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Deserts, dry areas with _____ no vegetation, cover more than one-third of the Earth's land surface.

A．surprisingly

B．eventually

C．permanently

D．virtually

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All too _____ it was time to go back to school after the glorious summer holidays.

A．often

B．fast

C．soon

D．late

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