There is ____"u" and ____ "s" in the word "bus''这一类题目怎么分辨用a还是an呢?

There is ____ ''b'',____ ''u'' and ____ ''S'' in the word ''bus'' . There is ____“u” and ____“r”in the word “your” There is ____u and ____ s in the word bus''这一类题目怎么分辨用a还是an呢? 44.There is a big desk between ____ and ____. There is ____ m and ______ m and ______ m 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. There is ___o and ____uin the word house A.a,a B.an,an C.a,an D.an,a There is ____ fish and vegetables in the fridge. 写句子there is/there area boy and a girl 有一个男孩儿和一个女孩儿.____ ____ ____ ____ ____ ____ ____ . There are two boys over there.One is Mike and ____ is Alan. There is ____“u”in the word your.（填a或an） There is{ } u in the word found and{ }letter is in the middle of this word 选择适当形式填空There is ____ y and ____ s in the word yes There is ____ “o” and ____ f in the word of