Safety in school has been of great concern because of frequent reports about accidents _______ students got injured or killed while in school .
-Car prices have been going down sharply in the last 20 years. -It's not surprising because the law of market __________ the price of a product.
Undoubtedly, life teaches us not to regret over yesterday, for it has passed and is __________ our control.
__________ apple fell from the tree and hit him on __________ head.
The man pulled out a gold watch,__________ were made of small diamonds.
Michael's new house is like a huge palace,__________ with his old one.