— Do you know to our school yesterday?—Yes, he took a train here.A.when did he comeB. how he cameC. where he came
Every year, we plant many trees on _______ side of the road to make our city more beautiful.
If there are ______ trees, the air in our city will be _______ cleaner.
You shouldn't ____ the boy's mistakes.
______our teacher is ill, ______ he still comes to our class to teach us.
The teacher said that the earth ______ around the sun.