The first use of atomic weapons was in 1945, and their power ____increased enormously ever since.
#86339
A
is
B
was
C
has been
D
had been.
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Faced with a bill for $10,000, _____.
#86001
A
Smith has taken an extra job
B
the boss has given Smith an extra job
C
an extra job has been taken
D
an extra job has been given to Smith
Collecting stamps as a hobby___________ increasingly popular during the past fifty years.
#86319
A
becomes
B
became
C
has become
D
had become
A great number of people were killed in the big fire, and the number of the people who _____ missing _______still increasing.
#86042
A
were; was
B
are; is
C
were; is
D
are; was