你知道火车是什么时候发明的吗? .
Many people nowadays are talking about , but I know little about it. (黑洞)
On weekdays,we must school before 7:30 in the morning.(到达)
The students often ask Mr Li for some advice on improving .(英语口语)
Smoking your health, please give it up.(对…有害)
不要忘了提醒我日期和地点(完成译句)
Don't remind me of the date and place.