_____________, Mother will wait for him to have dinner together.
Although the causes of cancer_____, we do not yet have any practical way to prevent it.
______run fast should take part in the 400-meter race tomorrow.
Was it in the factory_____ you worked five years ago___ you learned the technique?
What is most obvious in this book are all those details of daily living which make Mrs. Richard _____ common.
The firemen managed to _____ the fire in time.