Only when I left my parents for Italy________ how much I loved them.
It was the first time in two years that I________ my youngest son face to face.
With our knowledge _________ practice, we can make contributions to our society.
My sister_______ the League last month and she has decided to _______ the activity to help the aged next week.
Life would be happier if we could only be born at the age of eighty and ________reach eighteen.
You’d better get the second-hand car ________ before you sell it.