Dolphins form extremely complicated allegiances and _____ continually change.
A.
enmities that
B.
that are enmities
C.
enmities that are
D.
that enmities
2.
Scientists are now beginning to conduct experiments on ____ trigger different sorts of health risks.
A.
noise pollution can
B.
that noise pollution
C.
how noise pollution
D.
how noise pollution can
3.
The Apollo 11 astronauts ____ Earth’s inhabitants witnessed on the famous first moonwalk on July 20, 1969, were Neil Armstrong and Buzz Aldrin.
A.
whom
B.
whom millions
C.
were some
D.
whom some were
4.
At the end of the nineteenth century, Alfred Binet developed a test for measuring intelligence ______ served as the basis of modern IQ tests.
A.
has
B.
it has
C.
and
D.
which has
5.
______ have at least four hours of hazardous materials response training is mandated by federal law.
A.
All police officers
B.
All police officers must
C.
That all police officers
D.
For all police officers
6.
A cloud’s reservoir of negative charge extends upward from the altitude at __the freezing point.
A.
temperatures hit
B.
hit temperatures
C.
which temperatures hit
D.
which hit temperatures
7.
In a 1988 advanced officers’ training program, Sampson developed a plan to incorporate police in enforcing environmental protection laws whenever _____ feasible.
A.
it is
B.
is
C.
has
D.
it has
8.
_____ will be carried in the next space shuttle payload has not yet been announced to the public.
A.
It
B.
What
C.
When
D.
That
9.
During free fall, ____ minute, a skydiver will fall at a constant speed of 120 m.p.h.
A.
it is
B.
which is
C.
being
D.
is
10.
The fact the most important ____ ratings period is about to begin has caused all the networks to shore up their schedules.
