You must concentrate _____ your study not on your clothes.
—Can you tell me _________? —I lost my MP3 player.
If it ________ this Saturday, we will ________ for a picnic.
The story is _________ and all of us are _______ in it.
— _______ we clean the classroom at once? — No, you _______. You _______ clean it after school.
There _________ a concert on Qixing Square next Monday evening.