The Browns held _______ they called “family day” once each year.

---Do you know the danger caused by smoking?---Yes, too many cigarettes can lead to_______ lung cancer.

____ was known to them all that Bob had broken his promise ____ he would give them a rise.

I don't know when______. When he ______,I'll call you.

So many uses have been discovered for this wood ____ the supply of white pine is becoming smaller and smaller.