We were about to leave the classroom _____ it began to rain.
#94729
A
while
B
when
C
as
D
before
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During the period of recent terrorist activities, people _____ not to touch and unattended bag.
#95159
A
had always been warned
B
were always being warned
C
are always warning
D
always warned
—How was ______ they discovered the entrance to the underground palace?—Totally by chance.
#93200
A
t that
B
e that
C
t which
D
t
Eugene's never willing to change any of his opinions. It’s no use _____ with him.
#92989
A
to argue
B
arguing
C
argued
D
having argued