男朋友从没送过礼物:英语高手来!请详细讲解谢谢!

1.These trousers are too big ,so I intend to exchange for a smaller______.
A.one B.suit C.pair D.trousers
2.There has been _____in the past few days,so the streets are covered with thick_____.
A.a heavy snow snow B.a heavy snow snows
C.heavy snows snows D.heavy snow snow
3.In________,you must do your very best to make the party_______.
A.a word successs B.one word success
C.a word a success D.words a success
4.I think I'll go for______with my cousin this weekend.
A.swim B.a swim C.swims D.swimming
5.A few building______were done a month ago because there were some cracks on the wall.
A.repair B.repairs C.repairment D.repairments
6.________will make a trip around the world during the coming summer vacation.
A.The Evens B.The Evens's
C.The Evenes D.The Evenes'
7.They have stored_______hay for the cows for the winter.
A.a large quantity of B.a large number of
C.many a D.quite a few
请详细讲解谢谢!