Great as Newton was, many of his ideas_____today and are being modified by the work of scientists of our time.

Great as Newton was, many of his ideas_____today and are being modified by the work of scientists of our time.

#104460

are to challenge

have challenged

are challenging

have been challenged

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So far a total of 19 cases______ and another 36 people are being treated on the assumption that they are infected with Legionnaires Disease.

#101811

were confirmed

have confirmed

are confirmed

have been confirmed

This coastal area        a national wildlife reserve last year.

#100553

was named

named

is named

names

-- It's so cold! Why are your windows still open?         --- Oh, they _______．

#101102

aren't closing

won't close

won't be closed

aren't closed

 --- Haven’t seen you for ages! Where have you been, anywhere? --- I _______ to New York City. I just got back.

#101918

was sent

have been sent

had been sending

would be sent

In order to find the missing child, villagers         all they can over the past five hours.

#99305

did

had done

have been doing

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