"Some students do homework three or four times a week"中为什么要有"or"而不是"and"

The students are busy__(do)some exercises whose clothes do some students wash? What do some students think of history? The students all like to do some after-school( ) Many students can do some work for the show（改成被动语态）Some work ( )( )( )( ) many students for the show It is meaningful for us students to do some voluntary work同义句It is meaningful —— —— students do some voluntary work. Some students do not do the eye exercises c____ at school.And some students often dotheir homework for one or two hours without a r_____. The students do some reading after class.改一般疑问句,the students do some realing afterclass?为什么some要不改为any?是不是因为do some reading是一个词组,不用改的原因? Our school makes a survey to find out( ) 选择题,请帮我选一下并解释 谢谢A. what do the students do on weekdays B. what the students do on weekdays C. How to the students do on weekdays D. Ho some students were late some students were late some （ ）students (china) So far many students ______(volunteer) to do some work for the show. some students s_____ do their homework on the computer,that's because Some of the students in his class seem （）to do their assign mentsunlwillingtiringboringintereting some students ask teacher ( ) to do with the problem,是用how 还是what Some students do homework three or four times a week中为什么要有or而不是and They want some else students to do it句子有一处错误,请改正