Collecting stamps as a hobby___________ increasingly popular during the past fifty years.
#86319
A
becomes
B
became
C
has become
D
had become
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Large quantities of polluted water_____ into the sea so that lots of fish died.
#86296
A
is flowing
B
was flowing
C
are flowing
D
were flowing
Half of the class ________ done most of the work. The left ________rather hard.
#44179
A
have ; is
B
has; is
C
have ; are
D
has ; are
“All _____ present and all _____ going on well.” our monitor said.
#86285
A
is; is
B
are; are
C
are; is
D
is; are