21. We stood at the top of the mountain east of the city, watching burning sun rising.
A. 不填; a B. the; a C. the; the D. 不填; the
22. Jane hopes to become a friend of _______shares her interests.
A. whomever B. anyone C. whoever D. no matter who
23. Light, ______ everybody knows, travels much faster than sound.
A. as B. which C. this D. that
