Math is boring and difficult.

Lisa, are you going to play ______ violin after school this afternoon? —No, and I’m going to play ______ chess with Tina.

Did you have breakfast this morning? — No. I got up late and went to school _____breakfast. [ ]

We are organizing a lot of activities to celebrate the _______ birthday of the Communist Party of China these months.

______ the airport, he was arrested（逮捕） by the police.