单项选择题
It was good ______ you to invite me to join in the party.
单项选择题 People eat a lot of sugar ______ cakes, soft drinks, sweets and so on every day.
单项选择题 Hearing a knock ______ the door, he hid himself ______ the door.
单项选择题 The monkey ______ the tree was eating the bananas ______ the tree.
