21. All of you can choose to take part in our after-class activities, which all take place under the _______ of experienced teachers.
A. guidance B. help C. power D. reception
22. Did you notice the ______ on the leader’s face when he heard 23 countries couldn’t get enough rice in Africa?
A. appearance B. description C. expression D. attitude
23. She had almost reached her destination when a delicious smell ______ her progress and she stopped.
A. deleted B. scratched C. arrested D. faded