A:that
B:when
C:which
D:what
A:some
B:neither
C:none
D:all
A:climbing
B:climbed
C:had climbed
D:to climb
A:that
B:the ones
C:those
D:one
A:it
B:this
C:that
D:one
A:one
B:that
C:it
D:some
A:this
B:that
C:he
D:it
A:(0,2)
B:(-1,2)
C:(-1,+∞)
D:(2,+∞)
A:[0,1]∪[2,+∞]
B:[0,1)∪[2,+∞]
C:[0,1]
D:[0,2]
A:M∪N=R
B:M∪CRN=R
C:N∪CRM=R
D:M∩N=M
A:M∪S=M
B:M∪S=S
C:M=S
D:M∩S=Φ
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