___________[A] Since [B] If [C] Unless [D] While

Since the weather is fine we ______walk for a while.A．mayB．mustC．might as wellD．will

___________A] when [B] since [C] for [D] whereas

_________[A] if [B] unless [C] as [D] lest

_________[A] So [B] Since [C] As [D] Thus

_________(59)A.unless B.ifC.as D.since

It worried her a bit ____ her hair was turning grey.A.while B.that C.if D.for