At the age of 14, Father had to leave school and start working. There would be no one to support the family _______ he not worked.
The trip will take about five months;it will be a long time ________ we meet them again.
This kind of medicine has a bad ________on our brains.
The chance I had been looking forward ________ at last.
The musicians were to play jokes on each other as well as play music,most of ________ was based loosely on the Beatles.
Studies show that _____ good health depends on _____ balanced diet and plenty of rest and exercise.