---It’s generous ________ Millie to donate all her pocket money to UNICEF.---Yes. It is really meaningful _________ us to do something for charities.
It’s easy ________ chess.
How long does it take you _____ to work?
_____ our group, Li Fei often goes to bed late _____ school nights.
—What time do you usually get _____? —Well, _____ six thirty.
There are ______ rules in my family, so what can I do?