根据句意及所给首字母补全句中说缺单词。1.We asked the man where the post office was,but he didn't r___.2.it's dark in the room_Please turn on the l____.3.The d__between the bank and the library is about four kilometres.4.The radio says the weather will drop b___zero in the evening.5.As we know, the sun r____in the east.