interested

exhausted

exciting

astonished

embarrassed

tired

amazing

suprising

Wide

28 tỉnh

I. Since or for

 1....since... ten o'clock
2...since...... Christmas
3....since.... last summer
4....for.... ten minutes

5.....for.... one month
6.....since.... my birthday

7.....since.... the last lesson

8.......for... a long time

9.....for.... a week

10.....since.. the beginning of the term

11....for..... ages

12.....since... me met the last time

II. since or for

1.She has been in hospital ...since.. this morning.

2.Joe has lived in London...for... five years

3.We have known each other...since... June 2010
4.How long have you been here? I have been here 

5. I have had thís teddy bear ...since. I was a little child

6. Jason had made music...for.. more than 25 years

7. My mother hasn't spoken to my sister ...for... three days

8.I have learned these word ...for... three hours

is watching-will see

-2/15

-4/35

-5/3

10

-8/3

-7/2

-9

-4/3

ht

a) Theo đề bài: OM = 3cm, ON = 7cm; 

 OM < ON.

 M nằm giữa 2 điểm O và N.

b) Ta có: ON = OM + MN.

Thay: 7 = 3 + MN.

 MN = 7 - 3 = 4 (cm).

HT

a.AB=AC - BC=5 - 3=2 cm

b.AB = CD

7C

8B