1. When you feel down, a warm hug with a smile is just _______ you need to cheer you up.
A. whether B. what C. that D. how
2. It is the best for this kind of plant to grow in _______ is warm and rainy.
A. that B. what C. which D. where
3. The secret was finally let out _______ the daughter was an adopted one.
A. which B. that C. what D. as
