—I finished all my work today． —If____, you can help others with their work．

Believe it or not, that is _____ people call the sixth sense.

_________you’ve known the importance of it, you should try your best to do it.

    we should exploit the Antarctic’s natural resources is open to discussion.

---Is that the small town you often refer to?---Right, just the one _______ you know I used to live for years.