21. After _______ seemed an endless wait, it was his turn to enter the director’s office.
A. that B. it C. what D. which
22. I would like to buy a book Life of Pi, but _______ was found in the book store.
A. nothing B. none C. no one D. neither
23. _______ should not be a serious disadvantage in life and work.
A. To be not tall B. Not being tall C. Being not tall D. Not to be tall
