When a student asks it is worth staying up doing their lessons, a teacher may find it difficult to answer.
Every year a great number of foreign tourists pay a visit to _____ we Chinese call Heaven Lake.
----Did you see a child dressed in red pass by?----Sorry, I _____ the poster on the board without noticing anyone.
The teachers believe ______ punishment is by no means ______ wise choice to help the pupils grow healthily.
----Daddy, I want to watch my favorite program I Am a Singer tonight.----_______. You must finish your homework.
I shall never forget those years _______ I lived in the country with the farmers, ______ has a great effect on my life.