In extreme weather, a worn tyre can break easily ______ it’s mended, as is often the case.
#68135
A
when
B
where
C
which
D
that
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We won’t give up ______ we should fail 10 times.
#67611
A
as if
B
except for
C
in case
D
even if
I have bought two ballpens, _______ writes well. 
#73768
A
none of them
B
neither of them
C
neither of which
D
none of which
 You’d better make a mark ______ you have any questions.
#71971
A
at which
B
at where
C
the place
D
where