There is _____"u"and______"h" in the word "hour"为什么？a和an的各有哪些

There is _____ “u” and “s” in the word “use”.A.aThere is _____ “u” and “s” in the word “use”.A.a;a B.a There is_____land_____t in the world let There is _____u and _____t in the word 填an或a There is ()uand()sin the word useful. There is ( )uand ( )s in the word us there is ( )u and( )n in the word aunt There is ( ) u and ( ) r in the box.为什么? There is a U and anS in () use. My school is _____ ,and it is very _____.Look,this building is a _____.There are two _____. There is a desk _____ Li Lei and Wu Dong. Our English and Chinese _____(teacher) office is over there. There is____ s and _____ u in the word sun 为什么选an...a... There is _____“U”in the word “unhealthy”（用“a”还是“an”） There is{ } u in the word found and{ }letter is in the middle of this word 为什么不是There is a (h) and an (u) in the word (hour).而是There's an (h) and a (u) in the word (hour).Thank you~ there is (a soccer ball and a basketball) on the floor.括号提问_____ _____ _____ on the floor There is( )hand( )uin the word house为什么“h”前用“an”,“u”前用“a”? It is a fact that there is a _____（一代）gap between parents and children. There is a (h) and an (u) in the word (hour).这句英文对吗