Tree Planting Day is on ______ of March.
Can a plane fly _____ the Atlantic Ocean?—Yes, but it needs to go _____ the clouds for hours. [ ]
She goes to see afilm______ his father.[ ]
The population of China is much ______ than that of ________ country in Africa.
She looks very sad. I want to help her, but I just don’t know ____ to do it.