some students are busy ( ) their homework.A,on B,with C,for D,to

Look Some students are singing and o____ students are dancing Some students are very active and exercise Some students are( ) the school lidrary The students are busy__(do)some exercises Some students are taking p__near the Some students are in the room.(对划线部分提问）划线部分是Some students there are some students in the hall(划线提问 一般疑问句 否定回答)some students 划线 Some of the students are American,ang one of the students are from England.【改错】 some of the students are playing baketball,______ students are playing footbother or the other why? technical books are used only bu students and teachers majoring in law请问majoring 做什么成份? The teacher with some students are 还是is plating trees. There are some students in the classroom,______反义疑问句 改为否定句 There are some students in the classroom. There are some students in the ciassroom ,（ ）（ (反义疑问句) are there some students in the classroom找错误改正 There are some students in the classroom (改为否定句) There are some students in the classroom.否定句 Some students are m_____each other for the first time.