根据句意及首字母提示, 把句子所缺单词补充完整。
(1) The months of winter usually are N ________,D _________ and J _____.
(2) Shanghai is in the e _______ of China.
(3) Teachers’ Day is on the t _______ of S _______.
(4) The ball is 200 yuan. It is d _______.
(5) This plane f ______ to Guangzhou every day.
(6) Beijing is a b ______ city.
(7) The box is h _____. I can’t carry it.