The fact has worried many scientists _____ the earth is becoming warmer and warmer these years.
#68141
A
which
B
that
C
as
D
what
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He offered to drive me to the airport, I felt so grateful.
#69402
A
to whom
B
to which
C
for which
D
for whom
While Helen __________ the guitar, her mother came in.
#41299
A
was playing
B
is playing
C
played
D
plays
It was in the factory producced TV sets our friend was murdered.
#70088
A
which ; which
B
that ; which
C
that ; that
D
where ;that