1.No one knows _______ it will last.

1.No one knows _______ it will last.
A.how far B.how long C.how soon D.how often
2.Most of the people ____ lost their lives in the accident are American.
A.when B.how C.which D.who
3.You have to be ____ 18 to drink wine.
A.over B.on C.up D.in
天才快来帮我!选择后顺便帮我翻译这3句!谢