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 ____ "s" in the word "bus''这一类题目怎么分辨用a还 There is ____ ''b'',____ ''u'' and ____ ''S'' in the word '' There is ____"U" in the word bus . There is a"u "and a "s" in the word"bus' There is ____“u” and ____“r”in the word “your” There is ____ s and ___u in the word 填a还是an? There is ___"o" and ____"u"in the word "house" A.a,a B.an,an There is ______"u"and ______"s" in the word bus. there is [ ] ‘u’ and [ ]‘s’ in the word bus.填什么 There is ______ “u” and ______ “s” in the word “bus”. & 用a,an填空 There is __"u" ___ "s" and ___ "e"in the word There is ____“u”in the word your.（填a或an）