They considered ______a computer, which was considered ______a great help in their work．

Miss Chang plans to drop by her uncle when she reaches Beijing.

He realized his mistakes and took action to reduce theloss _______ it was too late.

A 6.5-magnitude earthquake ________ southwest China’s Yunnan Province on the afternoon of August 3, leaving 615 dead and more than 3140 injured .

This is the most serious and worst situation ________ I have ever experienced as a fan of the NBA.