sand前+an?There is a还是an “s”in the word“sand”

sand前+an?There is a还是an “s”in the word“sand” There is a p_ of sand beside the house. There is a key in the sand.划a key提问今天需要！！！！！！！！急！！！！！！！！！！！！！！！！！！！急！！！！！！！！！！！！！！！！！！！！！！！！！！急！！！！！！！！！ There is a sand—glass or hour—glass above翻译一下 There is an A,an U and______R There is ____apple tree in our school.这apple前应该用a,an还是the? 字母u前用a还是an?There is ___ u in the word umbrella.用a还是an? There is( )hand( )uin the word house为什么“h”前用“an”,“u”前用“a”? 英语there is __ u in university.是填a还是an?字母u前何时加an?请举例说明。 there is a a------ an amusement park Sometimes there is deep sand across it.还有：A driver must then put his foot down hard and drive through. when there is a game,there is an end. There is a pencil There is an egg. There is --- rand ---uin the word turn.A a,a Ban,a“u前用a能理解,为什么r前用“an? there is _____ typhoon. (a,an,the,/) we can use a to sand an e-mail there is h in the world hour,and h is the first letter of hour. A.a;an B.an;a C.an;the D.the;an在两个h前填答案 There is a mansion there.There is an edifice there.可不可以翻译成那里有一栋大厦