Complete the sentences with the given words in their proper forms（用括号中所给单词的适当形式完成下列句子。每空格限填一词）
【小题1】A famous scientist will give us a ______ next Monday.（speak）
【小题2】Although they are twins, they have different ______ .（person）
【小题3】The boy went back home ______ with his school report in his hand.（exciting）
【小题4】We should try our best to keep the listeners ______ in the context.（interest）
【小题5】I think it is ______ for him to buy such an expensive car with so little money.（possible）
【小题6】All our students took an ______ part in the school sports meeting.（action）
【小题7】What are you ______ talking about right now during this boring journey？（main）
【小题8】If you come closer, you’ll be able to see the new-fashioned car ______ .（clear）