( )every test用in还是on?

( )every test用in还是on? in every day还是on every day every Saturday morning 前面用什么介词,on还是in? 方位名词前用in还是on?还有exam与test的区别?急用! on a test or in a test? write ( ) it every day 里面是填 on 还是 in 在写作方面是：in还是on writing?l have a test ______ writing next week how to make sure 100 result on test every time 是fail the test 还是fail in the test? every meal 前面用in还是for? in the way 和on the way 谁是表示用.方式 还有every后是加名词单数还是复数 fashion用on还是in?