VI.

1.B with

2.A met

3.D keep

4.C users

5.B because

VII.

1.Paper,the main wrtting material today,was invneted by Chinese many years ago

2.We had better not throw rubbish into the streets 

3.Within the last 100 years,deserts have been growing at a frightening speed

4.Life in Vietnam in the year 2035 will be very different from what it is now

5.A lot of energy and resources can be saved by recycling

Mình phải đi học rồi nên làm phần dưới thôi nhá =((

cho mk cau tra loi hay nhat nha

VI.

1.B

2.A

3.D

4.C

5.B

VII.

1. Paper/ main/ writing material/ today/ invent/ Chinese/ years ago.
=> Paper which is main writing material today, was invented by Chinese.

2. We/better/not throw/rubbish/the streets.

=>We wouldn’t better throw rubbish the street.

3.Within / last / 100 years / deserts / been / growing / at / frightening /speed .

=>Within the last 100 years deserts have been growing at a frightening speed.

4.Life / VN/ year /2035/will/ be /very/different/ what /it/ now.
=> Life in Vietnam in year 2100 will be very different from what it is now.