21. George strongly recommended that the retired architect Tom _________ the construction of the new subway because of his rich experience and skilled techniques.
A. required B. reflect C. conquer D. undertake
22. After the accident she lost the _______ of speech and had to communicate with others entirely by gesture.
A. influence B. power C. energy D. effect
23. He reviewed the book for a while and went to bed, giving us the _______ that he was not nevous at all.
A. charater B. sight C. impression D. expression