1.One of the suspects is _________ schoolboy

1.One of the suspects is _________ schoolboy
A.a 18-year-old B.a 18 years old C.an 18 years old D.an 18-year-old
-Did you go to jack's birthday party?
_No,I______
A.am not invited B.wasn't invited C.an 18 years old D.an 18-year-old
What do you think of his surfing?
oh ,no one does____
A.good B.well C.better D.best
I'm sure that he_____to me as soon as he _____in Lndon
A.will write ; arrives B.will write ; will arrive
C.writes ; arrives D.writes ; will arrive
这是我期中考试里没把握的几道题目。