Beforeaproblemcanbesolved,itmustbeobvious______theproblemitselfis.
A. what
B. that
C. which
D. why
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Asmanyfivecoursesareprovided,andyouarefreetochoose______suitsyoubest.
A. whatever
B. whichever
C. whenever
D. wherever
Jerrydidnotregretgivingthecommentbutfelt______hecouldhaveexpresseditdifferently.
A. why
B. how
C. that
D. whether
Everyoneinthevillageisveryfriendly.Itdoesn'tmatter____youhavelivedthereforashortoralongtime.
A. why
B. how
C. whether
D. when
Evidencehasbeenfoundthroughyearsofstudy______children’searlysleepingproblemlikelytocontinuewhentheygrowup.
A. why
B. how
C. whether
D. that