It is hard to say what kind of person he is. Sometimes he is very friendly; at other times he ___ be very cold.
--Do you know when the Chinese custom_________ from? --It's hard to say. But its characteristics__________ the Tang Period.
--You went late the stadium yesterday evening, didn't you? --Yes, my wife was a little late _________ the supper.
After you have used the dictionary, please just put it back ____it belongs.
It is usually not quite cold in this area in March, but sometimes temperature be very low.
--__________ was it_________ they discovered the entrance to the underground place? --Totally by chance.