您要查找的是不是：
- Castles in the air cost a vast deal to keep up. 空中楼阁，要有一大笔费用来维持。
- You can't keep up the pretence any longer. 你不能再假装下去了。
- He can keep up until ten o'clock tonight. 今天晚上他能坚持到10点钟不睡。
- I hope the fine weather will keep up. 我希望好天气继续下去。
- Slow down I can't keep up (with you)! 慢点，我跟不上(你)了！
- You can keep my book as long as you like. 我的书你要借多久都随你的便。
- Please keep the watch for me while I go swimming. 我去游泳，请代我保管这表。
- They sang songs to keep their morale up. 他们唱 歌以保持高昂的士气。
- She likes to keep up with the latest fashions. 她喜欢穿戴入时。
- Keep it up! Final victory is in sight. 坚持下去！最后胜利已经在望了。
- A pianist has to practice every day to keep up to scratch. 钢琴手要天天练习才能保持高水平。
- Some boys wear suspenders to keep their trousers up. 有些孩子使用背带来吊住裤子。
- Prices keep going up to even more impossible levels. 物价不断上涨，涨到不可思议的地步。
- Mother set the pace so that her children would keep up with her. 妈妈定了速度好让她的孩子们能够跟上她。
- It was very thoughtless of you to keep her waiting so long. 你让她等那么久也太不体谅人了。
- It's important for the college freshman to keep his nose clean. 对大学新生而言洁身自好是很重要的。
- The government is trying to keep a low profile on this issue. 政府力图在这个问题上保持低姿态。
- If you keep practicing like that you'll soon be up with me. 如果你坚持那样练习，你很快就会赶上我的。
- Please keep the cards in sequence; don't mix them up. 请把这些卡片按次序放好，别把它们搅乱了。
- Keep away from that house. They have scarlet fever. 不要接近那一家，他们在患猩红热。
