1)

a - 3

b - 1

c - 5

d - 2

e - 4

2)

a screen

b speakers

c printer

d keyboard

e mouse

3)

a more expensive

b the most interesting

c the biggest

d better

e easier

4)

a couldn't

b could

c could

d couldn't

e couldn't

5)

a should

b should

c shouldn't

d should

e shouldn't