The new discovery _______ be of great service to mankind.
A、isboundtoA
beboundto：注定要，一定会。本题中主语是Thenewdiscovery，所以谓语动词要用is。句意：这项新发现对于人类必定大有用处。
IsitShakespeareTheatre_______youaregoingtowatchtheplayTheMerchantofVenice?
Iftheoperation________carefullyprepared,itwouldnothavebeensuccessful.
Itisimportantto________yourskinfromtheharmfulstrongsunlight.
Aftermonthsofvoyage,Columbusarrivedin______laterprovedtobeanewcontinent.
Whenyou're_____acrisis,itoftenhelpstotalktosomeone.
