At the conference , political leaders from many countries promised to work together to defend the world ________ terrorism and other threats.

Excuse me, Sir. But smoking is not allowed here.—Sorry, I didn’t see the sign. I’ll _______ mycigarette at once.

The experts present at the conference all insisted that greenhouse gas emissionbe reduced from now on．

We had hoped that you would be able to visit us, but you _____

1—I’ll do the washing-up.Jack, would you please do the floors–_______.