she pulled away from the window ______ anyone should see them.
A. even though
B. unless
C. only if
D. lest
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Mary doesn’t read newspapers; she reads Shakespeare, ______.
A. therefore
B. eventually
C. however
D. although
I don’t know about him, _______ comment on him behind his back.
A. let alone
B. lest
C. because
D. so
The children look light-hearted________ the final exam is over.
A. now that
B. as far as
C. up till
D. even though
Hygrogen is the fundermental element of the universe ____ it provides the building blocks from which the other elements are produces.
A. so that
B. but that
C. in that
D. provided that