When you are sleeping, you had better______ all the windows closed.
You are not ______ to smoke here. If you want to smoke, you can go outside.
Look! The tree is growing well. When______?
Mike’s training for our school football team ______ a lot of his free time.
Our school is ______ beautiful that it looks like a garden.
The general has drawn up a plan to ______the enemy(敌人).