In the reading room, we found her _______ at a desk, with her attention _______ on a book.
The time is not far away ________ modern communications will become widespread in China’s vast countryside.
I hope that the little ________ I have been able to do does good to them all.
There are several research centers in China ________ a certain disease called Bird Flu is being studied.
The treatment will continue until the patient reaches the point ________ he can walk correctly and safely.