By the time I saw the angry expression on his face, I ______ exactly what I was having to face. But not for a moment ______ I should quit.
---If you like,I can give you a ride home. ---That’s a very kind _____ .
_____ going to the program “If you are the one”, he was rather concerned about being turned down in public.
---I came all the way to inform you of the time and place of the meeting. ---You could have _____ yourself the trouble.
The fact has worried many scientists _____ the earth is becoming warmer and warmer these years.
It is required that each restaurant have signs on the walls,saying “ _____ your steps!”.