Life is like ______ ocean. Only ______ strong-willed can reach the other shore.
----- Do you have clothes ______? I’ll wash them for you. ------No, thank you. I will wash them myself.
______ a good insulator(绝缘体) , rubber is often used in cables.
I felt ______ tired, but he didn’t stop ______.
All of us need ______.
____ knocked down and hurt worried her friends.