What ______ have you given to Mr . Smith in his office .

Tom. Why do you look so tired? — Because I often study late ______ 10 o’clock at night.[ ]

Everyone knows that China is famous _____ the Great Wall in the world.[ ]

Do you know the name of the cat ______ is lying on the ground? –Of course, it’s my pet. Its name is Mimi.

More and more students _________ too much homework and they are really tired of it.