--- I hear a number of workers in the factory ______ out of work.--- Yes, and the number _______ quite huge.

The experts announced that anything _____ is good for the heart ____ good for the brain.

Knowing how to think clearly and how to speak correctly ________ one confidence.

Millie’s eyes ________ dark brown and her hair ________ black.

Generally speaking, students’ inner motivation with high expectations from others       essential to their development.