Найдите неправильные варианты, может один какой-то?

1) ..... an honest man.

a) It is believed that he is
b) He is believed to be
c) He believes to be
d) They say that he is

2) He will ... to solve the problem.

a) have
b) be able
c) be allowed
d) ought

3) If she asked, they ... help her.

a) would
b) will
c) might
d) could

4) We arrived ... much later.

a) to London
b) in London
c) at the bus station
d) at the airport

5) He was sure that he ... it well.

a) had done
b) does
c) was doing
d) would do

6) This doll is ... than that one.

a) far nicer
b) nicer
c) more nicer
d) mich nicer