---Is it Pro. King that will give the lecture on radiation?--- I can't __ I know it for sure.
The old man has three sons,and two _____ are doctors.
"How dare you say that?" The teacher said ___ to Tom.
We have to keep with the changing times.
---Be careful! Your clothes will catch fire. ---Thank you._______ so close to the fire.
He is an hour late by now.He last night.