Explorer Robert Ballard searched the sunken ship---the Titanic for more than 20 years and also, with his cameras, he _____ the hole along the side of the ship which had caused it to fill with water and sink.
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A
could find
B
managed finding
C
succeeded to find
D
was able to find
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Various efforts over the centuries _________ to predict earthquakes to reduce the damage.
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A
are being made
B
have been made
C
were made
D
were being made
—May I speak to your manager Mr. Williams at five o’clock tonight?—I’m sorry. He ________ gone to a party long before then.
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A
had
B
is
C
will have
D
has
—I have brought you the book you need.—Oh, good! I afraid that you .
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A
was; had forgotten
B
am; have forgotten
C
was; will forget
D
am; forgot
--Our English teacher is back home from Britain now.--Yes, she _____there for just three months.
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A
has been
B
had been
C
is
D
was