Tom likes playing ________ volleyball, but Lily likes playing ________ piano.
You'd better ride a bike to go to school _____ taking a bus every day.
--Remember this, boys and girls. _____careful you are, _____mistakes you will make. ---We know, Miss Wang.
_____trees are planted in our city every year.
You'd better not read today's newspaper because there is _____in it.
You made many mistakes in your English exams. What will you ___them?