He wrote many children's books, nearly half of ____ were published in the 1990s.
A. whom
B. which
C. them
D. that
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The little problems ____ we meet in our daily lives may be inspirations for great inventions.
A. that
B. as
C. where
D. when
My eldest son, ____ work takes him all over the world, is in New York at the moment.
A. that
B. his
C. whose
D. who
Those passengers will wait here____ the bus arrives.
A. until
B. because
C. though
D. as
Has the meeting begun yet? --Not yet, we have to wait____ everyone is here.
A. where
B. until
C. or
D. however