Qian Xuesen， the father of China's space program， is generally considered as the greatest s in China．
The t number of the students in our class is 45，twenty girls and twenty﹣five boys．
Nobody is a to smoke in the park because there is a sign "No smoking" here．
A Chinese scientist called Youyou Tu won the Nobel Prize in 2015and she is the p of all Chinese people．
W the help of my friend，l won't be able to do the job well．
The weather was terrible，but the bus they took arrived s at last．