There are two oranges here, you may choose________this one________that one.
A. either; or
B. both; and
C. neither; nor
D. not only; but also
He missed the first bus, ________he was late for the meeting.
A. so
B. or
C. for
D. because
He said the earth________round.
A. was
B. are
C. is
D. were
The thought________her mother may lose eyesight worries her.
A. which
B. what
C. that
D. why