loading24. He paid the boy 10 dollars for washing ten windows, most of ___had not been cleaned for years.
A. these B. those C. that D. which
25. In the dark street, there wasn't a single person ____ she could turn for help.
A. that B. who C. from whom D. to whom
26. This is one of the means ____ the electric energy is conducted from one place to another.
A. by which B. by that C. through which D. through that
27. The place ___ you are going to visit is the ruin of a place.
A. in which B. at which C. where D. which
28. The factory ___I am going to is the place ___my mother used to work many years ago.
A. where, where B. where, which C. which, where D. that, which
29. Don't do such things ___ you are not sure about.
A. that B. which C. as D. what
30. Robert is good at language, ___ we all know.
A. because B. for C. as D. since
Key:
1-5 BCCDA 6-10 CCDAC 11-15ABBBC 16-20ABBBB 21-25 DBBDD 26-30ADCCC