-----Have you been to New Zealand? -----No, I’d like to, _____.

Travelling west, you set your clock ______; travelling east, you set it ahead.

Henry was away from home for quite a bit and _______ saw his family.

Although modem organic food has become very popular, many people can' t figure out the difference between organic foods and ______ grown foods．

 Strong sandstorms are often _____ you cannot see the sun.