The new discovery _______ be of great service to mankind.
A
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。
Theboycomplained_______apaininhisstomach.
支持代孕的理由有
AtanyrateIdidnotsucceed_______myselfunderstoodbyyou.
Hewas______towithdrawfromrunningforthepresidency.
Itisimportantto________yourskinfromtheharmfulstrongsunlight.
