Researchers have found clear and convincing evidence ________ happiness isthe key to better health and longer lives.
#92775
A
where
B
whether
C
how
D
that
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Both she and her friends liked travelling. She traveled a great deal, ________.
#92020
A
nor did most of her friends
B
did as most of her friends
C
as did most of her friends
D
so do most of her friends
______ unless I call you. 
#94749
A
Please come
B
Not come in
C
Don’t come in
D
Come in