But apart from these findings, what else do we know about human sleep with any kind of certainty? It is known that humans sleep, like other mammals, according to a daily cycle. Once asleep, they switch between four different stages of unconsciousness, from stage one sleep, the shallowest, to the stage four, the deepest. When dreams occur, which is usually during the lightest sleep, the brain paralyses the body except for the hands and eyelids, thus preventing injuries.

Don’t you remember anything about your lifetime in London as a child?                                            ( recollection)

“ I don’t mind where the money goes as long as the people are the real beneficiaries.” ( matter)

Pick out the word whose underlined part is pronounced differently

There are 10 mistakes in the following passage. Find them and correct them

          Many different kinds of insurance are available to deaf people today but weren’t in past. It was the year 1898 that an insurance company for deaf people was born. A small group of young deaf man had a meeting in this year. They were all worried. At that time, only deaf people were not allowed to buy insurance. The group worked hard during the three years making research. They were ready for action at the second meeting. That meeting was historic because the men found the Fraternal Society of the Deaf. The first few years on the Fraternal Society of the Deaf were difficult. There was no money for an office, so they worked in their home. Since the company was very young, there was no money to pay for deadly benefits. If a member passed away, each of the other members gave one dollar to help pay for burial costs. As time passed by, the company grew. As it grew, the benefits improved. Health insurance has added. In 1905, the first office opened in Chicago, Illinois. In 1907, the name of the company changed. The new name, still is used today, was the National Fraternal Society of the Deaf, NFSD.

The thought of what might happen next fills me with horror.

I dread .................................................................................................................. .