A serious effort or attempt to do something challenging

Someone who gives a gift or a donation in order to help others.

To include or involve as a necessary part or result of something.

Great in size, amount, or degree.

A wealthy .... gave the museum a large donation.

Swimming the 200-meter race in less than two minutes would....... a lot of training.

My dog died last year, so I have ...... for Deb's loss of her cat.

Jackie loves adventure, so her next ..... will be climbing a mountain.

The map shows the city's...... network of streets.

They saw a ..... of birds nearly covering the beach.

My ...... about what to wear makes me late some mornings.

In case the water was too cold, she tested it ....... with her toes.