질문 내용 :
1.this is one of the most dangeroussubstance known to (the man/man)

2.he was lying on the sofa, (the book/book) in hand

3.towards(the/x)end of (the/x)1950s he visited the philippines

관사 3개 질문입니다. 답과 설명좀 부탁합니다.^^