She was carrying a large, heavy box.
African elephants are very heavy!
The piano was too heavy to lift.
There was a heavy smell of bleach.
The word "on" is the preposition in this sentence.
an heavy attack
A good sentence for the word ballast is.......The ballast is not heavy enough and the boat is about to sink.
I had to contend with heavy traffic to get to the airport.
This wagon is so heavy for me!
I felt weary from all the heavy work I had to do.
The boxes were so heavy they were not moveable.
Heavy stars usaly go
The heavy rain is eroding the soil.
If your baggage is too heavy, a surcharge will be levied.
I have a pair of brass earrings and they are very heavy.
The girls books were so heavy it encumbered her.