The company has been _______ of President Smith for 20 years and who will _______ it after his retirement?
—What is he doing now?—He’s ________ the teacher in class now.
The trees in the school are good for our health. So please don’t ________.
We are so tired(累) these days because we have ________ homework .
—Why do you like dogs?—________ they are very friendly.
My class teacher is very good _____ us, and we love her very much.