He was seriously ill. That’s _______ he didn’t appear at the party.
I am sorry I can’t meet you at the station. I _____ by the time you come back from abroad.
Upon arriving home from a business trip, dad asked mum about my academic performance at high school and then _____ of my little sister, who was in junior school.
Do you think the possibly _____retirement will result in high unemployment rate?
We had our bad times but on the whole we are ____ happy with our life.
---Did you see clearly who the driver was? ---No, so quickly _____ that I couldn’t have a good look at the face.