______to give up smoking,he threw away his______ cigarettes.

______to give up smoking,he threw away his______ cigarettes.
后一个为什么是remaining 顺便把所有remain的高中考点讲下,
为什么不能Remain

emaining表示剩下的
[ri'mein]
n.剩余物; 残余；残骸; 遗体；遗迹, 遗址, 废墟
vi.留下, 逗留；剩下, 余留；留待
vi. & link v.仍然是, 依旧是
名词 n.
1.剩余物; 残余
The remains of the meal were[was]fed to the dog.
剩饭喂狗了.
2.残骸; 遗体
His mortal remains are buried in the churchyard.
他的遗体埋葬在教堂的墓地里.
3.遗迹, 遗址, 废墟
Here is the remains of a temple.
这里是一所寺院的废墟.
不及物动词 vi.
1.留下, 逗留
They remained there all through the year.
他们在那里一直待到了年底.
I remained six days in London.
我在伦敦逗留了六天.
He'll remain to accompany you.
他将留下来陪你.
2.剩下, 余留
Though the sore being healed, yet a scar may remain.
伤口虽然痊愈, 却可能留下伤疤.
There remained in the village only women and children.
村子里只剩下妇女和儿童了.
3.留待
You can't let the room remain like this.
你不能把房间老是弄成这样.
That remains to be proved.
这尚待证实.
4.保持；继续；仍然处于；依然
I haven't seen them for ten years. They remain as they were.
我十年没见他们了,他们还是从前那样.
5.取决于；属于
The honour remained with our motherland.
光荣属于我们的祖国.
不及物动词 vi. 系动词 link-v.
1.仍然是, 依旧是
The decision remains with the Government.
决定权在于政府.
The fact remains that we are still lagging behind the other classes in maths.
事实是我们在数学方面仍然比别的班落后.
Peter has become a judge but John remains a fisherman.
彼得当了法官, 但约翰仍是个渔民.
He remained firm in the face of the enemy.
他在敌人面前始终很坚定.
When I got back home, he remained listening to the radio.
我回到家的时候, 他还在听收音机.
Let things remain as they have been in the past.
让事情照旧吧!
及物动词 vt.
1.仍需去做（或说、处理）
2.逗留；不离去
3.继续存在

remain standing
站立
6.
remain calm
保持镇静
7.
remain silent
保持沉默
8.
remain neutral
保持中立
9.
remain valid; remain in force
继续有效
10.
Please remain standing