3. 那时他陷于危险中。 .
4. 多好的一位工人啊！ .
5. 他必定迟到了。果真如此。 .
Key:
A. DBADD
B. 1.thanks 2.grannies 3.turning 4.danger 5.kind
C. 1.He may be ill in hospital. 2.The old woman may not know the way.
3.He was in danger at that time. 4.What a good, kind worker!
5.He must be late. So he must.