a,Khảo sát và vẽ đths: y=x² - 4

b, Tìm m để phương trình có 2 no : | x - 2|(x+2) -2m +1 =0

a, Khảo sát sự biến thiên và vé đths: y = x²+4x

b, Từ đó suy ra : y = |x² + 4x|

c, Tìm m để phương trình có 3 nghiệm : | x² + 4x| - m - 3 =0

VERB TENSE or FORM

At this time, they ………………… hide and seek on the school yard. (play)

Carol ……………. a visit to Hanoi last week. (pay)

English as well as Math and Literature ……………. very difficult for us to study. (be)

I went climbing with him after he ………………… his homework. (finish)

Up to now, we …………………. many books about Ngo Bao Chau’s works. (read)

We ……………………. this place again someday. (visit)

The number of the unemployed ……………………… every day. (increase)

She …………………… to the radio cassettes then. (listen)

He ………………. and he feels exhausted now. (swim)

Yesterday the police reported that they ………………… the thief. (capture)

The owner of that house ………………………. abroad. (just go)

It was the third time I …………………… late for school last week. (arrive)

Paper ………………… in China many years ago. (make)

The robber ………………… away by the time the police ……………… (run / come)

The floor is ………………… every day. (clean)

While they …………………. soundly last night, a stranger entered. (sleep)

Many doctors believe treatments for many forms of career ………………… soon. (discover)

Nam rarely walks to school, but today he ………………… to school. (walk)

Anyone who …………………. the work yet won’t …………………… to leave now. (not finish / allow)

The bridge over the river ……………………… at the moment. (paint)

What a shame! I’d rather you (not/dismiss)………………………………. like that.

When I noticed the blank stare he (give)…………………… me, I (realize) …………… that he didn’t understand me.

Would you be so kind as (switch off)……………………………. the lights when leaving?

It’s imperative that the wildlife program (broadcast)………………………………………

The President (deliver)………….... a speech, but in the end he (change)……………..his mind.

I’m sorry I wasn’t in when you came round. I would like (see)…………………………… you.

I can’t understand why he (be)…………………………… so selfish. He isn’t usually like that.

Just inside the outer later of the earth's atmosphere (be)...........................the elements necessary to protect it from ultraviolet rays, extreme temperatures, and threatening foreign substances.

I hope you don’t mind my mentioning this but some rumors (circulate) ……………………… about your engagement to banker.

I didn’t see anyone but I (watch)……………………………….………

He has worked hard all the week, but today he (have)……………………. a good time at home.

There (be)…………………………………... a lot of changes since computers were invented

Nam (watch)………….................. TV while his friends were making cakes yesterday morning.

If we (not protect)………………………… the environment, our planet will be badly polluted.

When I came to school, everybody (be)…………………………………………….. there.

............................................... for lunch.

Let’s (get) ............................. the house (clear) ............................... up before he arrives.

Last year we (install) ................................... ordinary light bulbs in our house, but now we (use

She gets used to (take)………………………………………….. to the zoo on weekends

I suggest (use)…………………………………………………… public buses.

You always (complain) ………………………………………… about my cooking.

He wishes that he (work)………………………………… harder but it’s too late now.

Nobody would listen to the stories (tell)……………………………... by him so many times.

Don’t worry! She (be) …………………………………………..in a few minutes.

She (sleep)…………………………………….. for hours ! You must wake her up.

Tom (wash)…………………………… his hands. He has just repaired the T.V set.

Don’t forget to bring my dictionary when you (come)………………………... back tomorrow.

We would rather (stay)………………………………….. at home than go out on rainy days.

I’m sorry. I (not finish) ……………………………………….this work yet.

I (invite)…………………………………….. to her party last weekend.

I’d rather we (have)………………………………………… more time together.

Is Lan used to (write)………………………………………………………. to Maryam?

It took Mary two hours (travel) …………………………………..to the countryside last week.

His greatest ambition is (choose)……… (take part) ………..….in the Olympics London 2012.

None of the people (invite)……………………………………………..to the party can come.

I really don’t know why she (not/enter)………………………………the last contest. She (win)……………………………….the first prize easily.

She (leave)………………………………..school last year. Since then she (work) ...................................... as a waitress at a local pub.

They felt tired and hungry, so they (sit) ................................. down under a tree and (rest)................for lunch

Let’s (get) ............................. the house (clear) ............................... up before he arrives.

Last year we (install) ................................... ordinary light bulbs in our house, but now we (use) ................................................... energy-saving ones.

A: In your places, I (a. go) .......................................... by air.

B: If I (b. have) ...........................................enough money, I (c. take) ............................... your advice.

I'm sorry. I (not finish) ..........................................this work yet.

Poems as well as play (write) ..................................... by William Shakespeare.

How many times you (be) .................................... to Van Mieu?

They like (chat) ............................................. . They use the Internet very often.

I (have) .................................. a phone call while I (surf) .............................. the web yesterday.

If he saves up, he soon (be able) ............................................ to afford a new car.

What a mess! Duc’ toys (not put) .......................................... away.

If you feel like (stay) ........................................... with us, just send us a fax.

My sister and I (stay) ...................................... at our grandparents when we (meet) ....................................... our great grand aunt for the first time.

Listen to these students! What language they (speak) ................................................?

What you (do) ......................................... If you had a lot of money?

Did you advise Jane (join) ................................... in the Vietnamese speaking contest?

Who (carry) ........................................ your bag when you climb Mount Phanxipang?

In Viet Nam, it (not snow) ................................... in winter except for Sa Pa and Lang Son.

We (always/ make) ..................................... to work hard by our parents.

Their grandparents prefer (watch)...........................basketball to (play)...............................it.

My friends (wait) ................................................ for me when I got to the stadium.

Nothing (do) ............................................ since he moved here.

To avoid (attack) ...................................... again, the millionaire hired some guards.

VERB TENSE OR FORM

Uncle Ho devoted his life …………………. the independence for Vietnam. (gain)

I think we …………………… some canned food before typhoon. (buy)

I suggest …………………… solar energy instead of coal, gas and oil. (use)

Why not ………………… another products ? (choose)

Let her ……………… her best to finish her work in time. (try)

Unfortunately, he ………………….. three accidents recently. (have)

A new photocopier …………………. in last week. (put)

He would be healthier, if he ……………… so much. (not, smoke)

Road users …………………… by law to wear quality safety helmets. (force)

Please wait right here until Katie …………………… back. (come)

His daughter is interested in ………………… with Barbie dolls. (play)

Mrs. Linda is busy ………………….. Christmas tree. (decorate)

They are the first customers ………………… and ………… things in the shop. (come / buy)

Do you have difficulty ………………….. a job after …………………. ? (find / graduate)

It was impossible to use fire-fighting equipment because most of the water pipes ……………….…… before. (burst)

They wish they …………… the displays of fireworks near the city tonight, but I can’t. (see)

I like reading books ………………… about different people and their cultures. (tell)

I saw an accident while I …………………… for a bus at a bus stop. (wait)

Tuan ………………… as the most effective activist in the charity program. (just / nominate)

Ninety percent of earthquakes ………………. around the Pacific Rim. (occur)

When he reached our house, mother …………………… (leave)

Thousands of people ………………….. in the tsunami in 2004. (die)

We’ll bring along raincoats in case it ……………………… (rain)

The boy who …………………. outside is my neighbor. (wait)

I remember ……………………… to the circus by my grandmother when I was 6. (take)

He is the last student ………………….. the classroom. (leave)

By the time the police reached the station, the robber …………………. away. (run)

Where is the magazine I gave you ? What ………………………. with it ? (you / do)

I think I hear someone ……………………. to open the back window. (try)

Nam wishes he ………………………. a lot of time last year. (not waste)

She couldn’t go with them because she was busy ………….. on the exam next time. (work)

Children hate …………………… (make) ……………… (do) a lot of homework.

The teacher as well as his students ………………… reading books. (like)

The boys …………………… the play for the school anniversary celebration. (rehearse)

He wishes he ………………. a doctor. (be)

I’ll come and see you before I ……………… for Ho Chi Minh city. (leave)

It’s time you …………………… for the party tonight. (prepare)

He used to ………………… to school by his mother when he was young. (take)

He started …………………. the guitar when he was five. (play)

I’s rather you ………………….. that mess again. (make)

Mary hates ………………………… by her friends. (recognize)

This shirt is too tight for him ………………….. (wear)

This knife is only used ……………………. the fruit. (cut)

Stop playing ! You …………………… for 4 hours. (run)

Kieu’s story …………………… by Nguyen Du a long time ago. (write)

The audience was made …………………… by the funny clown. (laugh)

Not until 1995 ………………………………… on Tien River. (a bridge/build)

After the recess, our teacher went on ……………………… the lesson. (explain)

Do you have any difficulty ……………………. English ? (study)

If Ben …………… up early, he can catch a bus. (get)

When I am living in Paris for my new job, I ………………………. you. (visit)

George is going to buy a new computer unless it ………………… too expensive. (be)

Our teacher said that she ……………………… us the following day. (examine)

He wishes he ……………………… able to speak French well. (be)

These children …………………………… tennis for four hours now. (play)

Your Russian is very good. How long ………………………. it ? (you / learn)

Come on. It’s time you ……………………… the new job. (finish)

Now musical instruments …………………………… already. (buy)

Town criers shouted the latest news as they …………………… through the city. (walk)

I would rather you ……………………… your written test well. (do)

One of the boys wanted to know what ………………… to that man the previous day. (happen)

Though being unsuccessful, they ……………………… a good match. (play)

He wishes he ………………… wings to fly around the world. (have)

Would you like …………………… that famous scientist ? (meet)

He doesn’t like being ……………………… like that. (treat)

The large number of people attending the course …………………… every day. (increase)

That boy is looking forward ……………………… ……………………… (go / picnic)

Uncle Ho devoted his life ……………………… the way to rescue Vietnam. (find)

Think carefully, I am sure you ……………………… her name. (remember)

The books in the library ………………………… into sections. (arrange)

Look ! That nice-looking girl ……………………… an elephant. (ride)

Television first ………………………. fifty years ago in the 1950s. (appear)

I ……………………… for her for over 30 minutes, but she ……………… yet. (wait / arrive)

Would you mind ……………………. quiet in a moment ? (keep)

Do you think English is quite easy ……………………… ? (learn)

The headmaster ……………………… the result of the contest next week. (announce)

Hurry up or the train ………………… before you catch it. (leave)

By the time the police arrived, the robbers …………………… away. (run)

They ……………… in Scotland for ten years. But now she lives in Liverpool. (live)

This coast must ……………………… in England ten years ago. Look at the label. (make)

Some trees ………………………… on the pavement at the moment. (plant)

This is the student who ……………………… by the teacher this morning. (praise)