Cathy had quit her job when her son was born ______she could stay home and raise her family.
A. now that
B. as if
C. only if
D. so that
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Half an hour later, Lucy still couldn't get a taxi ______the bus had dropped her.
A. until
B. when
C. although
D. where
If you don't understand something, you may research, study, and talk to other people______ you figure it out.
A. because
B. though
C. until
D. since
My grandfather still plays tennis now and then, ______ he is in his nineties.
A. as long as
B. as if
C. even though
D. in case
______scientists have learned a lot about the universe, there is much we still don't know.
A. Once
B. Since
C. Though
D. Unless