用括号内所给单词的适当形式填空。
A balanced diet can help us keep__________. (health)
School is over. Some students are busy __________the floor, (sweep)
The Greens live on the __________ floor in this tall building, (six)
Look! The boys and girls are playing games __________. (happy)
Many kinds of__________ are on show in Changchun Park every year. (flower)