Câu 1 : The girl about whom I was telling you is waiting in the hall (Đúng)
Câu 2 : Emma, who has good knowledge of this subject, wrote this article (Đúng)
Câu 3 : There wasn't any directory in the telephone box from which I was phoning( Đúng)
Câu 4 : Mr Bond for whom Stella works is a very strange man
Câu 5 : Towns which attract tourists are usually crowded and expensive (Đúng)