1)If a nation increases its production of consumer goods, its people will better live…..
a)today
b)now
c)in the future

2)If a nation increases its production of consumer goods, its people will better live…..
a)today
b)now
c)in the future

3)Michael ..... this film several times already.
has seen
a)saw
b)did see
c)had seen

4)Last year conditions in the market ..... very difficult for us.
have been
a)were
b)had been
c)has been

5)A nation’s income is the sum of the incomes of all the people ….live in that country.
whose
a)which
b)who
c)whom

1) c)

2) c)

3) c)

4) a)

5) b)

Предложение 2) такое же, как и 1), посмотрите, может опечатка у вас получилась. А в остальных предложениях какие-то слова, не обозначенные буквами a, b, c. Я их не использовала.