4.A commercial advertisement is one which someone has paid for to promote a product or service.

3.We are so used to them that we often do not even realize how many we see and hear in a day.

2.Below is an article about advertisements written by a student for her English project.

1.You many have seen pictures similar to the ones below because they are all advertisements.

9.As early as 200 BC, the Silk Road, which was the route for trade between the East and the West, was in use.

M4U1

8.As you know, China has many historical sites and some of them are being kept for exploration.

7.It is believed by many people to have been gradually covered over by sandstorms from AD 200 to AD 500.

6.I was very hungry by the time we arrived.

5.I was too tired to eat anything we were given.

4.It is hard to imagine how this quiet volcano destroyed the whole city!