应该是on a school day还是at a school day 这个短语中,应该不应该加“a”?

应该是on a school day还是at a school day 这个短语中,应该不应该加“a”? on school night还是nights on school day还是days 是on school day还是in school day in a rainy day还是on a rainy day? 是in a windy day还是on a windy day? on a good day还是in a good day? 是in a snoWY day还是on a snoWY day 是in a foggy day 还是on a foggy day It's a ( )day.括号里面应该是sun还是sunny? Do you have a School day ( ) your school A at B on C about D of in a cold day 还是 on a cold day 用in 还是 on如题 have a school day We have ( ) school Day at our school.( )中应填a还是an还是不填 汉译英：我们步行去上学,应该是We go to school on foot,ok?还是 Shall we walk to school,ok?另外ok应该是大写还是小写? 作文：a three-day school tripYou went on a three-day school trip during the last vacation.Write a travel diary for your school magazine. We will have a free day with no school or work on May Day 改为同义句We will-------the day------on May Day on rainy day还是in a rainy day介绍下ON 和IN用法 There`s( )school on Children`s Day.