B4

We use paper today in many different ways - in books and in newspapers, for example. Although most people probably don't think about its history, paper goes back a long way.

(степени сравнения)

MORE

B5 

The ancient Egyptians cut down plants that grew along the River Nile.

(past simple, т.к. говорится об определённом времени в прошлом cut cut cut)

CUT

B6

The plants, which needed to be cooked, were added to water.

(past simple, т.к. говорится об определённом времени в прошлом)

NEED

B7

This liquid was left to dry in the sun on special screens.

(past simple passive, т.к. говорится об определённом моменте в прошлом)

LEAVE

B8

This 'papyrus' gave us the word 'paper', but paper itself wasn’t invented until 105 AD.

(сам 3 лицо, ед. число)

IT

B9

In that year, a Chinese man called Ts'ai Lun created paper using bamboo and bits of old cloth.

(используя)

USE

B10

By 1,000 AD, the secret of paper-making still hadn’t reached Europe.

(past perfect, т.к. действие завершилось до определённого момента в прошлом)

NOT REACH

B11

Since the technology finally arrived in Spain and Italy in the twelfth century, paper has grown into a part of everyone's lives.

(present perfect, т.к. событие не завершилось, оно действительно и по сей день)

GROW