Thetimehascome_____wemakeextensiveuseofnuclearenergy.
A、When
B、while
C、as
D、since
Marykeepstalkingabouttheparty.Shehadaverygoodtime,______she?
A、hadn't
B、had
C、didn't
D、did
Thedesk_____TomisleaningisJack's.It'scoveredwithdictionaries.
Hisparentswouldn'tlethimmarryanyone____familywaspoor.
A、ofwhom
B、whom
C、ofwhose
D、whose
Ifhe____ontouristsforhisbusiness,hewouldhavetoclosehisshop.
A、depends
B、willdepend
C、depended
D、haddepended