请说明理由,thanks!

请说明理由,thanks!
1.-Did you have an English exam last week?
-Yes.And I got _______ point and came ______ in our class.
A.ninety-eight,forth B.ninty-eight,fourth C.ninety-eight,fourth
2.-The train is leaving right now,but David hasn't arrived yet.
-Well,he said he ______ here on time.
A.came B.will be C.would come
3.-I'd like to go hunting with you,but I have a meeting ________.
-If you don't go,__________.
A.to attend,so do I B.attending,so will I C.to attend,neither will I
4.-Do you know _________?
-Of course.It's 1956 kilometres long,from Xining to Lhasa.
A.how long is Qinghai-Tibet Raiway
B.how long Qinghai-Tibet Raiway are
C.Qinghai-Tibet Raiway is