It is said that dogs will keep you _________for as long as you want when you are feeling lonely．

Some people always take seriously the ______ of the complete globe end in the near future. 

In order to understand the____ of the animal, she spent many years recording its daily activities.

—Why haven’t you bought any butter? ---I_____ to but I forgot about it.

We all agree that the products of this factory are of better ________.