—Do you love teaching, Miss He?—I fell in love with teaching in 2000. I ________ for twelve years by this summer.
The sun shines brightly in the sky______ us light and heat.
This is the ______ bag ______ lost yesterday, but it’s not mine.
----- 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 ______.