Here are the correct forms of the words to complete the sentences:

1. There aren't any vegetables and fruits **left**. We should go to the supermarket and buy them. (LEAVE)

2. It was so **tasty** when I tried eating sticky rice for the first time. (TASTE)

3. My Grandma is cooking sweet soup **fragrant**, so I can't wait to enjoy it. (FRAGRANT) — Note: The correct form should be "fragrant" but in this context, it may be better to say "fragrant" directly without needing any modification.

4. Viet Nam cuisine has a **variety** of unique foods from different areas. (VARIABLE)