To save the drowning child, the boy plunged into the icy water without hesitation, ____ his own safety.

After a serious illness, he finally _______ how important his health is.

Great changes ___ since he left his hometown.

The more ______ you listen to the tape, the ______ you will find it to understand.

Would your parents like to go to Taiwan for a vacation with you? —They’d love to, but ______of them has enough time .