There is ____ ''b'',____ ''u'' and ____ ''S'' in the word ''

There is ____ ''b'',____ ''u'' and ____ ''S'' in the word '' There is ____"u" and ____ "s" in the word "bus''这一类题目怎么分辨用a还 There is ____“u” and ____“r”in the word “your” There is ____"U" in the word bus . There is ___"o" and ____"u"in the word "house" A.a,a B.an,an There is ____ s and ___u in the word 填a还是an? there is ____ "u" in the word "hour" A:a B:an C:the （尽量详细点） There is ____“u”in the word your.（填a或an） There is ____"r" and ___"m" in the word room.A a,a B an,a C 1.There is ____"a"and_____"s"in the word "as" 选项有（A：an;an B： There is ____ “ m ” in the word “mother”. 1.There is ____ "h" in the word "hour"