Everyone knows that _____ is dangerous to play with fire, but _____ is difficult is to prevent children from playing with fire.
You ___ me, but since you have,I’ll keep it secret from others.
If you have something important to do, you ___ waste any time.
---Where is my reference book? It was here a moment ago.---Someone ___ it by mistake.
Ireland lies ___ of Britain.
The boy promised ___ mother never to lie to ___ again.