The defendant pleaded not guilty to the charges.

He tried to grasp the concept, but it was too difficult.

The university received a large endowment from a generous donor.

The volatility of the stock market makes it difficult to predict future prices.

I received a packet in the mail today.

I need to rewrite this paragraph.

She spoke plainly and directly.

The clarity of her explanation made it easy to understand.

The parity of a number determines whether it is even or odd.

The dissolution of their relationship was painful for both of them.