【帮我看看这几个定语从句题1.Itisusefultobeabletopredicttheextent___whichapricechangewillaffectsupplyanddemand.AfromBwithCtoDfor2.I'veneverbeentoBeijing,butitistheplace___AwhereI'dliketovisitBImostwant】

　　帮我看看这几个定语从句题

　　1.Itisusefultobeabletopredicttheextent___whichapricechangewillaffectsupplyanddemand.

　　Afrom

　　Bwith

　　Cto

　　Dfor

　　2.I'veneverbeentoBeijing,butitistheplace___

　　AwhereI'dliketovisit

　　BImostwanttovisit

　　3.Itmakesnodifference___wewillsharetheofficewith.

　　Aif

　　Bwhether

　　CWho

　　4.All___isacontinuoussupplyofthebasicnecessitiesoflife.

　　Awhatisneeded

　　Bthethingneeded

　　Cthatisneeded

　　5.____peoplespendsomuchmoneyontheirpets___usalot.

　　AThat,issuprised

　　BHow,aresurprised