An ecosystem consists of the living and nonliving things in an area ________ interact with one another.
A.that B.where C.who D.what
We still have the question of ______ they have discovered the trade secret.
A.what B.why C.how D.that
—Have you heard any news about Sarah?
—Yes, she was promoted to president of her company, __________surprised everyone.
A.who B.that
C.which D.it
They truly believe ____________ beauty comes from within.
A.which B.what C.that D.who
They have leading experts in this field, and that’s ____________ they’ve solved this problem successfully.
A.where B.why C.whether D.who
Finding a date ____________ suits everyone seems difficult.
A.that B.when C.what D.where
