Bài 4:  Cho góc bẹt xOy. Trên cùng một nửa mặt phẳng bờ xy, vẽ các tia Om và On sao cho   và nhỏ hơn 900.  Gọi Oz là tia phân giác của góc mOn. Chứng minh rằng: 

Bài 5:  Cho góc AOB = 400. Vẽ tia OC là tia đối của tia OA. Tính góc COD, biết rằng:

a) , các tia OD và OA thuộc hai nửa mặt phẳng đối nhau bờ OB.

b) , các tia OD và OA thuộc cùng một nửa mặt phẳng bờ OB.

Ex 2: Rewrite the following sentences
1. Jessica studied very hard. Jessica didn’t get a high mark.
→ No matter________________________________________________
2. In spite of the expensive cost , my friend decided to buy that dress. 
→ Even though______________________________________________
3. Although it snows heavily, his house is very warm. 
→ Despite__________________________________________________
4. In spite of his 40 years, he still looks very young. 
→ Even though______________________________________________
5. She is going on a diet but she can’t lose any weight.
→ However_________________________________________________
6. I regret that you didn’t give me a chance to tell you the truth.
-> If only _______________________________________________
7. I’ d like to take some photographs but I didn’t bring my camera.
-> I wish ___________________________________________________
8. They didn’t tell me the truth.
-> I’d rather _______________________________________________
9. I want him to come my home tonight.
-> I’d rather __________________________________________________
10. She wasn't wearing the coat although the weather was quite cold.
-> Despite __________________________________________________
11. We came to the show late because the traffic was terrible.
-> Due to ____________________________________________________
12. Although he has a very important job, he isn't particularly well-paid.
-> In spite of __________________________________________________
13. She behaves like a rich woman. (as if)
-> _________________________________________________________
14. He is not blind. Still he walks with a stick. (as though)
-> ___________________________________________________________
15. The boys shouted loudly. One might think that they had won a prize. (as if)
-> ______________________________________________

Ex 1: Choose the correct answer
1. ….. you come tomorrow, I will give you a cake.
A. When
B. Before
C. As
D. While
2. She doesn’t listen; …. she makes mistake.
A. when
B. while
C. after
D. therefore
3. She turned down the radio so that she wouldn’t disturb the neighbors.
A. She turned down the radio so as not to disturb the neighbors.
B. She turned down the radio in order not to disturb the neighbors.
C. She turned down the radio in order that she wouldn’t disturb the neighbors.
D. All are correct.
4. He gave me his address. He wanted me to visit him.
A. He gave me his address so as to visit him.
B. He gave me his address for me in order to visit him.
C. He gave me his address in order for me to visit him.
D. He gave me his address in order to for me visit him.
5. He lighted the candle ________ he might read the note.
A. so that
B. and
C. because
D. as a result
6. He turned off the lights before going out _______ waste electricity.
A. so that not
B. as not to
C. in order that not
D. so as not to
7. _____ Lisa likes ice cream, she tries not to buy it.
A. As             B .Though         C. Since         D. Despite
8. In spite _____ , the basketball game was not postponed.  
A. the rain         B. of the rain       C. it was raining       D. there was a rain
9. ______ he could afford , he refused to buy a new car .  
A. In spite        B. In spite of          C. Despite           D. Although 
10. Mrs. Johnson couldn’t come to the meeting on time, though she took a taxi.
A. Even though taking a taxi, Mrs Jonhson couldn’t come to the meeting on time.
B. In spite of taking a taxi, but Mrs. Johnson couldn’t come to the meeting on time.
C. Mrs Jonhson couldn’t come to the meeting on time despite he took a taxi
D. Mrs Jonhson couldn’t come to the meeting on time although having taken a taxi.
11.  _______ they are twins, they do not look alike . 
A. Although   B    B. Even             C. Despite            D. In spite of 
12. Even though Taylor had a cough and running nose, she still went to Rihana's concert.
A. In spite of her  cough and running nose, Taylor went to Rihana’s concert.
B. Taylor had a cough and running nose because she went to Rihana’s concert.
C. Taylor went to Rihana’s concert despite having a cough and running nose.
D. Taylor had a cough and running nose. However, she went to Rihana’s concert.
13. She made lot of mistakes but I wish she______
a. didn't
b. hadn't
c. wouldn't
d. did
14. My wife wishes she______ the guitar now
a. could play
b. can play
c. could have played
d. plays
15. Yesterday he missed the lesson. He wishes he______ it.
a. didn't miss
b. hadn't miss
c. hasn't missed
d. hadn't missed

0m75=...dm

0m75=...cm

V, Finish each of the following  sentences in such a way  that it means the same as the sentence printed before it. 
1. He studied badly and he couldn’t pass the exam. 
  → He studied so ______________________________________. 
2. He isn’t very intelligent. He can do it. 
  → He isn’t _____________________________________________. 
3. He has a lot of money. He can buy a car. 
  → He has so __________________________________________. 
4. The room is so untidy that it took us one hour to clean it. 
  → It is  _________________________________________________. 
5. The man is so fool that no one took any notice of him. 
  → He is________________________________________________. 
6. The film is so long that they can’t broadcast it on one night. 
  → It is  _________________________________________________. 
7. The books are so interesting that we have read them many times. 
  → They are____________________________________________. 
8. The news was so bad that she burst into tears on hearing it. 
  → It was_______________________________________________. 
9. The food was so hot that it burned my tongue. 
  → It was_______________________________________________. 
10. There is so much rain that we can’t go out. 
  → It____________________________________________________. 
11. The boy is so fat that every calls him Stuffy. 
  → He is________________________________________________. 
12. The milk is so excellent that all the children want some more. 
  → It is_________________________________________________. 
13. The weather was so warm that they had a walk in the garden. 
  → It was_______________________________________________. 
14. There were so many people in the hall that we couldn't see him. 
  → So many people ___________________________________. 
15. The match was so exciting that all the fans shouted loudly. 
  → It was_______________________________________________. 
16. They drank so much coffee that they couldn't sleep all night. 
  → So much____________________________________________. 
17. Alice had so many exercises to do that she couldn't go out. 
  → Alice had such______________________________________.   
18. The woman was so poor that she needed everyone's help. 
  → She was_____________________________________________. 
19. The boy is too young to walk to school alone. 
  → He was so young___________________________________. 
20. The car was very rusty and they could travel far in that car. 
  → The car was too_____________________________________.

IV,  Finish each of the following  sentences in such a way  that it means the same as the sentence printed before it. 

2. He can't afford to buy the car. 

→ The car _________________

3. The play is so popular that the theatre is likely to be full every night. 

→ Such is ________________________________________. 

3. Alice lost all her hope; she decided to stop her business. 

→ Such was ______________________________________. 

4. He is very strong. He can lift the box.

 → He is __________________________________________.

5. He ate a lot of food. He became ill.

→ He ate ________________________________________. 

6. He bought lots of books. He didn't know where to put them.

 → He bought ____________________________________.

7. He is a very lazy boy. No one likes him.

→ He is such ____________________________________. 

8. The coffee is too hot . I can't drink it.

 → The coffee is too _____________________________.

9. Her voice is very soft. Everyone likes her.

 → Her voice is so _______________________________.

10. He is so weak. He can’t run.

 → He is too _____________________________________.

11. The tea was very hot. He couldn’t drink it.

 → The tea was so ______________________________.

12. The weather is so bad that we can’t go out. 

 → The weather is too _________________________.

13. The film was so boring that we couldn’t go on seeing it. 

 → It was such _________________________________.

14. He was so old that he couldn’t run fast. 

 → He was such ________________________________.

15. He spoke so fast that we couldn’t understand him. 

 → So fast ______________________________________.

16. The fair was so noisy that we couldn’t hear each other.

 → The fair was too ____________________________.

17. You speak so fast that I can’t catch up with your words. 

 → You are such ________________________________.

18. It is so early that we can’t go out. 

 → It is too ______________________________________.

19. The water is too hot for me to drink.

 → The water is so _____________________________.

20. The restaurant is expensive so we can’t eat in that restaurant. 

 → The restaurant is so _______________________

23. Because I am too poor, I cannot buy this house.
=> Because of _________________________________.
24. Because the dress was so beautiful, I bought it.
=> Because of _________________________________.
25. Because the dog was too aggressive, the children were scared.
=> Because of _________________________________.
26. She’s so ugly that no one wants to play with her.
=> She is such a________________________________.
27. Rain was so heavy that the streets were flooded.
=> Because____________________________________.
28. He tried very hard. As a result, he passed a master’s degree
=> Because he__________________________________.
29. This shirt is torn. Therefore, I take it for repairs.
=> Because this shirt_____________________________.

8. The train came late because it was foggy.

Because of .....................................................

9. All the teachers love him because his conduct is good.

Because of ……………………………………………………………………….

10. We stopped our car because the traffic light turned red.

Due to ……………………………………………………………………

11. Many families break up because of a lack of money.

………………………………………………………………………………………

12. Because of an explosion of gas line, several houses burned down.

………………………………………………………………………………………

13. We postponed our trip because of the bad driving conditions.

………………………………………………………………………………………

14. I could not make a good choice because of many advertisements.

………………………………………………………………………………………

15. Rice plants grow well because the climate is warm and damp.

………………………………………………………………………………………

16. We have to cut down on our driving because of the oil shortage.

………………………………………………………………………………………

17. The World Trade Center fell down because it was attacked by terrorists.

………………………………………………………………………………………