您好 ！用 keep .
remain intransitive verb
①(stay in same place)逗留to remain behind留下
②(stay in same condition)保持不变your season ticket will remain valid until the end of the year你的季票有效期一直到年底her question remains unanswered她的问题仍未得到解答
③(be left over)剩下if any bread remains, give it to the birds如果有剩余面包的话，喂给鸟吃吧a lot of work remains to be done还有许多活儿要干
④(continue to exist)遗留not much remained of the aircraft after it crashed飞机坠毁以后残骸所剩无几
keepkeep|kiːp|
A.transitive verb(past tense, past participle kept)
①(cause to remain)使保持to keep [something] clean/dry使某物保持清洁/干燥to keep [somebody] awake/amused使某人醒着/开心
②(retain)保留to keep [somebody's] attention保持某人的注意力keep the change不用找零钱to keep a car for two days用两天车
③(reserve)预留to keep [something] for [somebody], to keep [somebody] [something]为某人留某物she kept him a piece of cake她给他留了一块蛋糕
④(put, store)存放to keep [something] in a box/drawer etc.把…放在箱子里
⑤(sustain)使继续进行to keep [something] going让…不熄灭‹fire›让…延续 ‹tradition, discussion›to keep [somebody] waiting/talking/laughing让某人一直等/不停说话/笑个不停
remain 常可与stay 互换, 但它强调“继续停留于一处或保持原状态、情况性质而不改变”, 如:
This place remains cool all summer.
这个地方整个夏天都凉爽。
stay强调“某人[物]继续留在原地而不离开”, 如:
He stayed to see the end of the game.
他一直呆到比赛结束。
keep 系常用词, 指“使继续下去”“使较长时期地置于不脱离控制、掌握、照料或变化之下”, 如:
keep the room clean.
保持室内清洁。
这个只能记忆搭配了。
remain +形容词
to be done
keep +形容词
宾语（sb.）+形容词
所以这里只能用keep啦。
keep理解为保持，remain虽也有此意，但大部分意为遗留
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