1.Scientists have created _______ intelligent food wrapping material that changes color if _______ contents are going bad.
A. an; 不填 B. 不填; the
C. an; the D. the; 不填
2. —I have decided to spend my summer holidays in France.
—_______ I’m sure you’ll have a good time.
A. How are you? B. Let me see.
C. Sounds wonderful. D. Well done!
