Why will Billie Smith give the presentation？
He will help them to solve the problem of ______.
We are prepared to________(采取武力) if negotiation failed.
If you want your CD player to know where each song of the album begins, you __ to your CD.
The "grid" will enable you to get on your computer the power of __ in the wodd.
What will they learn？
They will learn about ______.
People are accustomed to think that a man in uniform. does ______.