1,big本身有比较级,不能用less修饰,less只能修饰多音节形容词比较级.所以应该说:not big enough.另外,furthermore用在句中要加and,最后city要加定冠词the
The house is not big enough for us,and furthermore,it is too far away from the city.
2,没什么问题
3,包裹应该是复数parcels,另外最好用一般现在时,圣诞节拼错了
The old couple seldom receives parcels at other times except Christmas Day.