1.He looked quite healthy though he was ( B )

1.He looked quite healthy though he was ( B )
A.in her seventies B.in his seventies C.before seventy D.seventy -year-old
2.Do you know who was considered ( C) the first TV set?
A.to invent B.inventing C.to have invented D.invented
3.Helen had to shout (D) above the sound of the music.
A.making herself hear B.to make her heard C.making herself heard D.to make herself heard
4.--Where shall we meet?
--Our (A) place,of course,where we usually get together.
A.usual B.popular C,ordinary D.general
5.(B) to such lectures is of no use
A.Listen B.Listening C.Listened D.We listen
答案我给出来了，我要的是解析。