cho tứ giác ABCD có hai cạnh đối AD và BC bằng nhau.Gọi M,N,P,Q lần lượt là trung điểm của AB,AC,CD,BD.
a)Chứng minh:MQ=NP=MN
b)Chứng minh:MP vuông góc với NQ

cho tứ giác ABCD có hai cạnh đối AD và BC bằng nhau.Gọi M,N,P,Q lần lượt là trung điểm của AB,AC,CD,BD.
a)Chứng minh:MQ=NP=MN
b)Chứng minh:MP vuông góc với NQ

Word form:

16. Bell (success) ___ demonstrated his invention.   

17. (fortunate) ___, I lost my keys on the way home.   

18. Each of my friends has (difference) ___ characters. 

19. The boys shouted (excite) ___. 

20. You must put all medicines in (lock) ___ cupboards. 

21. Those clothes are (suit) ___ for cold weather. 

22. Most teenagers like talking part in (communal) ___ service. 

23. Bell and Watson (successful) ___ demonstrated the invention at countless exhibitions.
24. Last week, Suga actively (participation) ___ in social work.

25. I'm not (satisfaction) ___ with the way he cut my hair. 

26. He always talks about his son (pride) ___. 

27. Nam likes acting and outdoor (act) ___. 

28. Is that ladder (safety) ___? 

29. We need to (electric) ___ the whole country as soon as possible.
30. Hard work always brings (succeed) ___. 

Word form

1. We're keeping you here for your own (safe) ___. 

2. Jimin's father is doing a (chemist) ___ experiment in his laboratory. 

3. Don't leave the lights on. It wastes (electric) ___. 

4. This machine has an (electric) ___ fault. 

5. The (destroy) ___ of atom bomb is very terrible. 

6. The disco was so (noise) ___ that you couldn't hear yourself speak.  

7. She's always worried about the (safe) ___ of her family.  

8. Jennie thinks the food in this restaurant is (taste) ___.  

9. This river is very (danger) ___ for swimmers.  

10. I'm (extreme) ___ sorry for the delay.  

11. I tried to lead a (health) ___ lifestyle - lots of exercises, fruit, and no junk foods.  

12. You have to keep all (danger) ___ objects out of children's reach.  

13. You ought to do the test (care) ___.  

14. I'm (interest) ___ in working in the garden.  

15. These shoes are small, but they are very(comfort) ___.  

Word form 

1. We're keeping you here for your own (safe) ___. 

2. Jimin's father is doing a (chemist) ___ experiment in his laboratory. 

3. Don't leave the lights on. It wastes (electric) ___. 

4. This machine has an (electric) ___ fault. 

5. The (destroy) ___ of atom bomb is very terrible. 

6. The disco was so (noise) ___ that you couldn't hear yourself speak.   

7. She's always worried about the (safe) ___ of her family.   

8. Jennie thinks the food in this restaurant is (taste) ___.   

9. This river is very (danger) ___ for swimmers.   

10. I'm (extreme) ___ sorry for the delay.   

11. I tried to lead a (health) ___ lifestyle - lots of exercises, fruit, and no junk foods.   

12. You have to keep all (danger) ___ objects out of children's reach.   

13. You ought to do the test (care) ___.   

14. I'm (interest) ___ in working in the garden.   

15. These shoes are small, but they are very(comfort) ___.   

16. Bell (success) ___ demonstrated his invention.   

17. (fortunate) ___, I lost my keys on the way home.   

18. Each of my friends has (difference) ___ characters. 

19. The boys shouted (excite) ___. 

20. You must put all medicines in (lock) ___ cupboards. 

21. Those clothes are (suit) ___ for cold weather. 

22. Most teenagers like talking part in (communal) ___ service. 

23. Bell and Watson (successful) ___ demonstrated the invention at countless exhibitions.
24. Last week, Suga actively (participation) ___ in social work.

25. I'm not (satisfaction) ___ with the way he cut my hair. 

26. He always talks about his son (pride) ___. 

27. Nam likes acting and outdoor (act) ___. 

28. Is that ladder (safety) ___? 

29. We need to (electric) ___ the whole country as soon as possible.
30. Hard work always brings (succeed) ___. 

Prepositions. 

1. Keep those medicines ______ of the children's reach. 

2. Kitchen is not a suitable place ______ children to play.  

3. There is a bus station ______ the end of this road.  

4. You shouldn't let children play ______ matches.  

5. There is a refrigerator ______ the right corner of the room.  

6. Please put these books ______ the bookshelf.  

7. The secretary took a message ______ her boss. 
8. Quang Hai and Van Duc are quite reserved ______ public.  

9. ______ Sunday night I went to bed at 11 o'clock.  

10. This led ______ the invention of the telephone.  

11. He came up ______ a new idea for increasing sale.  

12. Can you help me ______ this heavy bag?  

Complete the sentences with MUST or HAVE / HAS TO.

1. Oh, it's later than I thought. I ______ go.  

2. She's a really nice person. You ______ meet her.  

3. You can't turn right here. You ______ turn left. 

4. You ______ do something.  

5. I haven't phoned Lisa for ages. I ______ phone her tonight.  

6. I ______ get up early tomorrow. There are a lot of things I want to do.  

7. My eye sight isn't very good. I ______ wear glasses for reading.  

8. Van Lam can't come out with us this evening. He ______ work.  

9. It's 11 o'clock. I ______ go now.  

10. Vietnamese children ______ wear uniform when they go to school.  

11. Last night my sister was ill. We ______ call the doctor.  

12. I have bad toothache. I ______ make an appointment with the dentist.  

13. I don't want to ______ wait in a queue for ages.  

14. This is a terrible party. We ______ go home.  

15. If there are no taxis, we'll ______ walk.  

16. Jennie ______ go to the bank. She hasn't had any money.