1.交换生The exchange students 2.熬夜stay up late ；stay up all night ；work or gamble until deep into the night ；burn the midnight oil（其中stay up late比较常见） 3.早上好Good morning，或者简单地说morning（口语中常用）4.按时on...
1.exchange student 2.stay up 3.good morning 4.in time 5.可数的用 how many (How many pencils do you have？)你有多少枝铅笔? 不可数的用 how much (How much do you have?)你有多少钱?
