1 How does she go to school everyday?

2 Where does your sister work?

3 What are you having for breakfast?

4 How many boys and girls are there in your class?

5 What is Thu reading?

Ta có: ∠B + ∠C = 90o nên sinC = cosB = 0,8

Từ công thức sin2C + cos2C = 1 ta suy ra:

Tóm tắt :

l=2m

S=0,2mm2=0,2.10−6m2S=0,2mm2=0,2.10^-6m2

ρ=1,7.10−8Ωmρ=1,7.10−8Ωm

R = ?

Bài làm

R = ρ . l/s = 1,7.10^-8 .2/0.2.10^-6= 0,17Ω

Question 18. Although Peter has lived in Viet Nam for only a month, he knows how to use chopsticks when eating. 

Question 19. My sister practises playing the piano every day in order to become a famous pianist. 

Question 20. It is cheaper to go by train than by air.

Question 21. The tree has lovely flowers which stands near the gate of my house.

Question 22. Despite living in a big house, they only use the ground flour.

Question 23. The craft village must also meet environmental requierments so that it wants to develop craft village tourism.

Question 24.Hoa's elder sister is 5 years older than her.

23 area 24 valleys 25 limestone 26 destinations 27 species

23 area

24 valleys

25 limestone

26 destinations

27 species

will buy tương lai đơn nhé

12C

13B

14 C

15 C

16 C

17 A

19. I started studying/to study three years ago.

21. I got wet in the rain yesterday so I was sick.

22. A new language school has been built in that area.

1A

2 A

3 C

4 B

5 D