Add appropriate question tags to the following sentences:
a) Helen has booked our tickets.
b) Our team hasn’t won any matches yet.
c) We are travelling by bus.
d) Mr. Prasad is giving seminar at the college auditorium.
e) He is coming to the show.
f) The wall was ten feet tall.
g) This is a difficult question.
h) Mrs. Verma is at home.
i) They weren’t invited to the party.
j) Hiren was ashamed of his conduct.
k) The man was robbing people at gunpoint.
l) This is the road to the University.
m) His father is a weaver.
n) Reshma was her best friend.
o) She isn’t ready for her solo performance.