用适当的介词填空。 1. Danny isn't ____ school today, and he has been ____ for three weeks. 2. I'm going to play basketball on the playground ____ school. 3. There are plenty flowers in the garden. 4. What shall we write our poster? 5. Let's make a poster ____ drinking. 6. Drinking too much is also bad ____ your health. 7. I have an idea ____ your plan.