At first the institute refused to purchase(购买)  the  experiment  instrument,  but  this decision was ______ changed.

He dived_______into the river to save the girl and I was ______ moved by his deed.

 ----- How often do you go home? ----- _________.

The test not only helps make our _____ acquired knowledge permanent, but also enables us to find out what needs to take more time to improve.

A car accident happened on the highway because of the heavy fog, but 　　　 no one got seriously injured.