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2.Sufficient
gravitational force is ______ atmosphere;
otherwise the atmosphere will drift off
into space.
necessary for retaining planet
retaining necessary planet
retained by necessary planet
necessary to retain a planet's
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3.While
oxygen is readily available in isolated
form, ______ .
hydrogen does not
no hydrogen
not any hydrogen
hydrogen is not
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4.The
[varying] orbit [of] Pluto
means that [ambient] temperatures
also [vary] greatly.
varying
of
ambient
vary
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5.Along
[northernmost] edge [of]
the United States [runs] the US/Canada
[border].
northernmost
of
runs
border
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6.In
most states a sales tax ranging from two
per cent to ten per cent ______ on most
purchases of luxury items.
is levied
are levied
to levy
levying
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7.An
iron smelting forge ______ ore into usable
metals.
melts
is melting
melting
should melting
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8.Only
after [losing] its skin does [snake]
begin [to grow] [another].
losing
snake
to grow
another
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9.[Lost
among] the [devastation] of
the tornado [was] the remains of
the houses and [buildings].
Lost among
devastation
was
buildings
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10.The
one in charge of a meeting ______ toward
the end of the meeting.
table general important topics
tables generally the important topics
generally the topic of the table
generally tables important topics
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