a. colour

A. colour  

(x+1)+(x+2)+(x+3)+....+(x+100) = 7450

=> 100x+ (100+1).100:2=7450

<=> 100x+ 5050=7450

<=>     100x= 2400

<=>            x=24

TA mà bn có phải là toán đâu

1 arrived - had gone

2 were doing - were lying

3 had eaten - arrived

4 was playing - was doing

5 went - had finished

There weren't any mobile phones a hundred years ago.

You can use a mobile phone to text your friends.

2. How many photos does he have now?

3. Which floor did they go up?

4. Who is the most interlligent student in the classroom?

câu 1 mk ko bt

1 go off

2 put off

3 turn up

Bài 2

1 go off

2 took after

3 turn off

4 go 

5 after

EX 4. Complete the sentences with the correct form in brackets.
1. You_____have bought______(buy) a new car.
2. I_________have been doing the gardening___(do the gardening) all day and my knees hurt.
3. They_____have not solved____(not solve) this problem yet.
4. Anthony, what____have you been doing______(do) in the attic for such a long time?
5. My hand________has swollen_____(swell) for 2 months.

EX 5. Choose the correct tense.
1. We didn’t need to clean the house because he had already done/already did it.
2. I studied business in the evening while I was working/had worked in the kitchen.
3. She left before anyone had had/was having a chance to explain the situation.
4. The business went/was going bankrupt last month and they couldn’t save it.
5. All last year, the company had looked/was looking for ways to survive.
6. When Akio Morita was 26, he had started/started his own company.
EX 6. Complete the sentences. Use Past Perfect or Past Simple.
1. Susan ___turned on____ (turn on) the radio after she ____had washed ____ (wash) the dishes.
2. When she __arrived_____ (arrive) to the match ______ already _______ (start)
3. After the man __had come____ (come) home, he __fed____ (feed) the cat.

1. Find and circle the words.

ssa^librarysh                         md^classroom

h^playgroundn                      ldf^schoolsf

                   sd^{computer room}d

2. write

classr..o.om                 computer r...o.om..

sch.o..ol                       libra.r.y

3. circle the odd one out.

1. a. library                   b. playground          ^{c. new}

2. a. open                     ^{b. old}                         c. close

3. ^{a. come}                    b. old                         c. small

4. ^{a. five}                       b. gym                       c. computer room

5. a. large                     b. old                        ^{c. playground}

6. a. big                        b. small                    ^{c. school}

4. match

1. Is that your school?                           a. No is isn't. It's small.

2. That's my school.                               b. Oh, it's big.

3. Is your school gym new?                c. No, is isn't. It's old and small.

4. Is the playground large?                   d. Yes, is it

1D 2B 3C 4A

ssalibrarysh: library

mdclassroom: classroom

hplaygroundn: playground

Idfschoolsf: school