Cho thí nghiệm mô tả như hình vẽ

Biết mỗi kí hiệu X, Y tương ứng với một chất. X, Y trong thí nghiệm trên lần lượt là hai chất nào sau đây?

A. CaSO3, SO2.       

B. NH4Cl, NH3.  

C. CH3COONa, CH4.  

D. KMnO4, O2.

1/ Nam is living with his aunt and uncle.

=>  Who is Nam living with?

2/ Lan's mother is a worker .

=> What does Lan's mother do?

3/ It's night hundred kilometers  from Ha Noi to Hue

=> How far is it from Ha Noi to Hue?

4/ They have geography on monday and saturday

=> When do they have Geography?

5/ She is listening to music  in the livingroom now.

=> What is she doing (in the livingroom) now?

6/ Mr. and Mrs. THuy are going to visit Da Nang for two weeks.

=> How long are Mr. and Mrs.Thuy going to visit Da Nang?

7/ Nam will be 19 on his next birthday.

=> How old will Nam be on his next birthday?

8/ I will give Lan a book at her birthday party.

=> What will you give Lan at her birthday party?

9/ That boy doesn't go to school because he is ill.

=> Why doesn't that boy go to school?

10/ Nam and Hoa often go to the cinema  at the weekend

=> Where do Nam and Hoa often go at the weekend?

Thời gian xe máy thứ 2 đi trước xe máy thứ 1 là :

 9 giờ 47 phút - 8 giờ 17 phút = 1 giờ 30 phút = 1,5 giờ

Quãng đường xe máy thứ 1 đi trong 1,5 giờ là : 

 12 x 1,5 = 18 km

Hai xe gặp nhau sau : 

18 : ( 36 - 12 ) = 0,75 giờ = 45 phút

Hai xe gặp nhau lúc : 

9 giờ 47 phút + 45 phút = 10 giờ 32 phút

My best friend writes to me every week.

Giải

Số phần trăm h/s nam chiếm là:

         100%-60%=40%

Số h/s nam là:

         30.40%=12(h/s)

                     Đáp số:12 h/s

Exercise 2 : complete the following sentences using the given word cues.

1. He/ be/ my/ father.

=> He is my father.

2. where/ he/ live?

=> Where does he live?

3. I/ usually/ have/ breakfast/ six.

=> I usually have breakfast at six.

4. She/ usually/ have/ breakfast/ six/ thirty

=> She usually has breakfast at six thirty.

5. Hoa/ always/ do/ housework/ after/ school

=> Hoa always does her housework after school.