When _______ comes to saving energy, big changes start with small steps, like turning off the lights.
Today, _______ people speak English as their first, second or a foreign language than ever before.
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.