请回答几道英语单项
1.Hisfatherishereandafriendof_ishere,too
A.hisfather'sB.hisfatherC.he'fatherD.hefather
2.---sheisnotsure_hisfatherwillcomebackhometomorrowornot
---maybesheshouldgiveherfatheracall
A.ifB.whatC.whetherD.where
3._she_I_wrong
A.Neither;nor;isB.Either;or;isC.Neither:nor:amD.Both;and;am
4.Hedidmuchbetterintheexams_heexpected
A.asifB.sothatC.sinceD.than
另外问一下,a遇到元音字母的哪个发音才用变成an?