当我国国产大型客机C919在2017年5月5日首飞成功时,所有中国人都为之振奋.
All Chinese people when China sent its homegrown large passenger plane C919 into sky on May 5,2017.
Every autumn, the (落下的) leaves make our school more beautiful.
To be safe,students should (避免) going out alone at night.
At the age of (四十), the writer finished his fifth novel.
You should (道歉) to her for your mistake.
Liu Yang is the first Chinese woman (宇航员) to enter the space.