The traditional goal of science is to discover how things are, not how they ought _____.
One advantage of eating a balanced breakfast is ______ it can keep you energetic throughout the day.
We often talk a great deal about English language teaching, ______ that it is the learning that really matters.
Many companies give away small quantities of their produce as samples ______ people can try them before buying them.
In the rainforest of the Amazon, 50 to 150 plant species ______ every day.
— This is a good place for a picnic.— Yes, it couldn't be ____ .