I listened to Dr. Johnson’s lecture about biology, but I failed to get its key ____.

Scientists have achieved a major ___ in the search for a cure for cancer, ____ is good news for those who suffer from cancer.

. --- If you accept this job, you will earn $10,000 a month and be provided with a house and a new car. --- Your ________ is inviting, but I’m not interested in the job.

___ will conquer nature.

What on earth did you tell her? The_____on her face suggested that she was very angry.