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.

Finish each of the following sentences in such a way that it means the same as the sentence before it

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

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

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

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

Paper making began in China and from there it ............. to North Africa.

The realization that I had mad a big mistake came later.

Only ................................................................................................................... .

Complete each sentence with a suitable preposition

I really don’t like the shoes, and ............. they aren’t my size, so I don’t want to buy them.

She herself admits to being rather selfish. ( admission)

I have been working very hard, I hope I will ........... my math exam.

He was poor, but he rent a mansion and set himself .............. as a millionaire.

You should pay more attention to those road signs about speed limits.                                                    ( notice)

He had to .............. a new syllabus as the old one was out-dated.