Those passengers will wait here____ the bus arrives.
A. until
B. because
C. though
D. as
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Has the meeting begun yet? --Not yet, we have to wait____ everyone is here.
A. where
B. until
C. or
D. however
You will fall behind others____ you work hard.
A. if
B. unless
C. even though
D. since
My grandparents prefer to live____ the climate is mild.
A. that
B. which
C. what
D. where
I was thin____ I was a child
A. where
B. when
C. who
D. that