You’d better wear a pair of comfortable trainers when ________a long walk. 
#41330
A
you take
B
taking
C
to take
D
A&B
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We stayed in a quiet hotel,__    _.
#69263
A
next to it was a thick wood
B
next to which was a thick wood
C
next to it there was a thick wood
D
next to which a thick wood was
He tried his best to solve the problem,     difficult it was.  
#66875
A
no matter what
B
whatever
C
however
D
how