____________ the dinosaurs disappeared still remains a mystery

I’ve got another job. I’m sure it’s a well-paid job this time.— It’s the third time you’ve changed your job, but it’s not always true that _________.

We will have a picnic ________ it doesn’t rain tomorrow.

It is required that under no circumstances ______ betray ourselves even if there are temptations like money or beauty.

The old man lives in a village_______, but he neverfeels________.