Great attention must be paid ____ welfare, especially in the poor area.

Sichuan Province, ________ in southwest China and ________ an area of 485,000 kilometers with the largest population in China, is one of the largest and most inaccessible provinces in China.

As a student, every minute should be made use of _______.

After completing and singing it, please return the form to us in the envelope _________.

The fire ______ at might was still seen ______ the next morning.