Wind power is an ancient source of energy we may return in the near future.
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A
on which
B
by which
C
to which
D
from which
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Whether you like it or not, we live in a particular community_______ exchanging presents is an important part of communication.
#76320
A
which
B
that
C
when
D
where
The new lecture course differs from the old one, ________ the students aren't required to attend lectures.
#78112
A
which that
B
that
C
which
D
in which
The sides of the Iran nuclear negotiation reached a key point, the result of ________ would have a great influence on the world peace.
#75842
A
that
B
which
C
whom
D
them
He suddenly fell ill, ______ prevented him from attending his friend’s wedding.
#76654
A
why
B
what
C
that
D
which
Dear Mom, I wonder if you ever knew how much I appreciated _____ you gave me even though I often simply said, “Thanks Mom.”
#78441
A
all which
B
all that
C
in that
D
for that