Một số nguyên tố > 3 thì sẽ có dạng 3k + 1 hoặc 3k + 2 

Với p= 3k + 1 suy ra p + 2 = 3k + 1 + 2 = 3k + 3 chia hết cho 3 là hợp số 

Vậy : p=3k + 2 .Ta có : p + 1 = 3k + 2 + 1 = 3k + 3 chia hết cho 3 ( 1 )

Vì  : p là SNT > 3 suy ra PLA số lẻ , suy ra p + 1 là số chẵn ( số lẽ + số lẽ = số chẵn )suy ra p+1 chia hết cho 2 ( 2 )

Từ ( 1 ) và  ( 2 ) suy ra p + 1 chia hết cho 6 ( một số chia hết hết cho 2 và 3 , chia hết cho 6 )

44, The gardener told us not to walk on the grass.

45, We used to drive our car to the city when we worked there.

46, David isn't tall enough to reach that shelf.

47, My bad is diffirent from her bag.

48 , a, play => playing

b, noisy => noise

2.Combine into one sentence with too or either ( then use so or neither )

1 . They can play tabletennis . We can play tabletennis

.................They can play tabletennis ................and so can we

2 . He sings loves songs very night . His sister sings love songs very well

.................He sings loves songs very night and so does his sister......................

3 . I wrire diary every night . My mother wrires diary every night

......................I wrire diary every night and so does my mother.................

4 . My father doesn't drink beer . My mother doesn't drink beer

..........................My father doesn't drink beer and neither does my mother.............

5 . She is swimming in the pool . Her children are swimming in the pool

......................She is swimming in the pool and so are her children.................

1, A

2, D
3, B

4, D

5, B

6, D

7, C

8, D

9, A

Sửa lỗi sai :

1, wastes => waste

2, leaving => to leave

tìm lỗi sai trong các từ in đậm

The students often collect wastes=> waste paper for recycling.

2.

1)Children ought not____to stay______up late at night(stay)

2)She__________has participated_________in social work for2 years(participate)

3.My mother__________bought_______a dictionary for me yesterday(buy)

4.___________Revision__________is neccessary,it helps you practice the words mor times(revise)

5.They're good at listening because they listen very___________well_______(good)

6.Scouting aims are building character,encouraging good citizenship and_____________personal____________fitness(person)

7.We should save___natural______recources(nature)

1.Complete sentences with so or neither

1 . I like Spring , and .........so does..... she

2 . The pineapples are ripe , and ....so are........ the cabbages .

3 . You mustn'n stop here , and ....neither must............ they

4 . He didn't eat beff and ....neither did............. his wife

5 . She like detective movies and ...so does............. her husband

1.Have you got a cheaper hat than this?

Is this__________the cheapest hat you have got ?__________________

2.Mrs.Scott is proud of her cooking.

Mrs.Scott takes pride in her cooking_____________________

3.Dini's parent gave her a watch for her birthday.

Dini____was given a watch for her birthday by her parents.__________________

4.There is no need for u to walk so loudly.

You don't______have to talk so loudly _______________

5.Mr.Long fixed the washing machine for me.

I had________Mr.Long fix the washing machine _________________

6.Lan is the tallest girl in her class.

No one____in Lan's class is taller than her._______________

7."Why don't you put your luggate under the seat?"he asked

He suggested_____that I should put my luggage under the seat___________________

8."Jin,please don't tell anyone my new address",said Mary.

Mary asked___Jin not to tell anyone her new address_________________