The Sina Microblog provides a good ________for those who want to express their opinions and exchange their ideas withothers.

Many experts stick to the view _____teacher development is _____ the key to quality education lies.

下列各句中不含通假字的一项是（ ）

What caused the fire— ______

When the big bills for mother’s hospital care came, father was glad he had money in the bank to _____.