Thenewdiscovery_______beofgreatservicetomankind.
A
be bound to：注定要，一定会。本题中主语是 The new discovery ，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。
It is difficult to ________ the implication between the lines.
Itisimportantto________yourskinfromtheharmfulstrongsunlight.
The central theatre has a seating ________ of more than 3, 000 people.