尽管双目失明,他仍然专心学习,给我们留下了深刻印象。(concentrate on,though)_______________________________________________________________________________
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.
It's our duty to protect the (环境).