a CD or a DVD on which large amounts of information, sound and pictures can be storedkeyboarda set of keys for typingprintera machine that puts the words and pictures onto papermousea small device moved by hand to move the cursor on a computer screenmouse mata small square of plastic that is the best kind of surface on which to use a computer mousehard drivethis can store more information than a floppy discmonitora screen that shows information from a computerscreena part where you can see the words and picturesspeakera part of the computer where the sound comes out

　　3. Read the instructions and do the exercises on page 47.Answers(1) keyboard   (2) mouse     (3) data      (4) floppy disks    (5) CD-ROMs

　　(6) CPU      (7) connect    (8) e-mails     (9) information   (10) Web

　　● Grammar and Usage

　　The grammar in this unit deals with the passive voice. You are expected to learn the basic verb forms of the passive voice and some special passive patterns

　　Step 1: Relative knowledge presentation

　　1. Passive Voice

　　The passive voice is used when focusing on the person or thing affected by an action.

　　The Passive is formed: Passive Subject + To Be + Past Participle

　　It is often used in business and in other areas where the object of the action is more important than those who perform the action. For Example: We have produced over 20 different models in the past two years. Changes to: Over 20 different models have been produced in the past two years.

　　If the agent (the performer of the action) is important, use "by." For Example:

　　Tim Wilson wrote The Flight to Brunnswick in 1987.

　　The Flight to Brunnswick was written in 1987 by Tim Wilson.

　　Only verbs that take an object can be used in the passive.

　　Tense or Model

　　Passive Sentence

　　Simple Present

　　The TOEFL exam is given every six months.

　　Simple past

　　The TOEFL exam was given last month.

　　Simple Future

　　The TOEFL exam this year will be given on October15.

　　Present Continuous

　　The TOEFL exam is being given every year.

　　Present perfect

　　The TOEFL exam has been given every year since 1950.

　　Past perfect

　　The TOEFL exam had been given before the Vietnam War occurred.

　　Simple Modal

　　The TOEFL exam should be given to every Foreign student.Past ModalThe TOEFL exam should have been given to all to enter US colleges.

　　The following chart includes sentences changed from the active to the passive in the principal tenses.ActivePassive

　　Time Reference

　　They make Fords in Cologne.

　　Fords are made in Cologne (科隆).

　　Present Simple

　　Susan is cooking dinner.

　　Dinner is being cooked by Susan

　　Present Continuous

　　James Joyce wrote Dubliners.

　　Dubliners was written by James Joyces.

　　Past Simple

　　They were painting the house when I arrived.

　　The house was being painted when I arrived.

　　Past Continuous

　　They have produced over 20 models in the past two years.

　　Over 20 models have been produced in the past two years.

　　Present Perfect

　　They are going to build a new factory in Portland.