---- What are you doing here now? ---- I’m thinking _________ chatting with my good friends.
We ________ not to go that way because the road ________.
I used ____ papers and watch TV after dinner. But now I’m ________ a walk.
We should be strict _____ ourselves ____ our work.
The number of the children in the school ________ about three hundred. ________ of them________ from the countryside.
China has a history of more than five ________ years.