Cho tam giác ABC có góc BAC = 90 độ ; M, K thứ tự là trung điểm của BC; AB; kẻ MH vuông góc AC ( H ϵ AC) 

a) Chứng minh AM=HK.

b) Lấy điểm G sao cho K là trung điểm của MG. Chứng minh ACMG là hình bình hành.

c) Gọi giao điểm của các đường thẳng GA và MH là E. Chứng minh: EC song song với AM. 

telepathy/ video conferencing /leave a note/ emailing /code/
face to face/ non-verbally/ language/ social media /snail mail/
45. Some people use various ............................................. applications to find career
opportunities, connect with people across the globe with like-minded interests, and share their own
thoughts or feeling. It allows individuals to keep in touch with friends and family.
46. His ambition was to meet his favourite pop star ................................................
47. ................................................ is an online technology that allows users in different locations
to hold face-to-face meetings without having to move to a single location together.
48. ....................................... is a paper mail sent through the postal service (as opposed to email).
49. He can communicate with her by ........................................ He has the ability to know what is
in her mind and to communicate with her mentally, without using any words or other physical signals.
50. We’d been ................................................ each other for six months before we actually met.
51. Using her telepathic abilities, she can communicate with us ................................................
52. What we’ll do is ............................................. for Mum to tell her we won’t be back till late.
53. The police use ................................................ words for their major operations.
54. Let your body ................................................, eye contact and facial expression show
involvement and receptivity.

Make sentences as in the example.
~ I hurt my arm. I couldn’t play tennis. -> ...If I hadn’t hurt my arm, I could have played tennis...
29. I get to school late every morning. My teacher is always angry with me.
..................................................................................................................................................................
30. I left my wallet at home. I didn’t buy the new trainers.
..................................................................................................................................................................
31. I have a sore throat. I can’t sing in the school choir.
..................................................................................................................................................................
32. It’s raining. We can’t go to the park.
..................................................................................................................................................................
33. Our football team didn’t play well. It lost the match.
..................................................................................................................................................................

Complete the second sentence so that it means the same as the first, using the word in bold. Use
between two and five words.
13. You’ll get ill if you don’t get some fresh air every day. unless
You’ll get ill ................................................................... some fresh air every day.
14. If you water your plant every day, it will live for years. provided
Your plant will live for years ................................................................... it every day.
15. I’ll tell you if you promise not to tell anyone else. long
I’ll tell you ................................................................... not to tell anyone else.
16. Take the keys because we might be out. case
Take the keys ................................................................... out.
17. If they don’t invite us, we can’t go. unless
We can’t go ................................................................... us.
18. If you have the receipt, we’ll give you your money back. providing
We’ll give you your money back ................................................................... the receipt.

IV. Use the ideas to write conditional sentences.
~ I passed my driving test. My father let me borrow his car.
-> ...If I hadn’t passed my driving test, my father wouldn’t have let me borrow his car...
24. Plants have to get enough sunlight. They die.
..................................................................................................................................................................
25. I must finish my essay first. Then I’ll come to the cinema with you.
..................................................................................................................................................................
26. Mum is still working. We can’t go to the part.
..................................................................................................................................................................
27. David missed the bus this morning. He was late for work.
..................................................................................................................................................................
28. Pour oil into water. It floats.

III. Put the verbs in brackets into the correct tense.
19. A: Why don’t you come out with us tonight?
B: Well, If I ........................................ (finish) my project early, I ..................................
(give) you a call.
20. A: I can’t believe you’re late again!
B: I’m really sorry. If I ..................................... (not / get stuck) in traffic, I .........................
......................... (be) on time.
21. A: Mr Henderson, how do I make pink paint?
B: Well Kim, if you ............................... (mix) white and red, you ........................ (get) pink.
22. A: What should we do, Tommy?
B: I’m not sure. If Dad .................................................. (be) here, he ............................
............................ (know) what to do.
23. A: Why didn’t you tell me that Jennifer is back from Rome?
B: Because I didn’t know! If I ............................................ (see) her, I ............................
(tell) you!

Cho tam giác ABC có góc BAC = 90 độ ; M, K thứ tự là trung điểm của BC; AB; kẻ MH vuông góc AC ( H ϵ AC) 

a) Chứng minh AM=HK.

b) Lấy điểm G sao cho K là trung điểm của MG. Chứng minh ACMG là hình bình hành.

c) Gọi giao điểm của các đường thẳng GA và MH là E. Chứng minh: EC song song với AM. 

Cho tam giác ABC vuông tại A, AB=8cm, AC=6cm; kẻ trung tuyến AM.

a) Tính AM.

b) Kẻ đường cao AH của tam giác ABC. Chứng minh góc HAB = góc MAC

tìm giá trị của n để đa thức 3n³ +10n² - 5 chia hết cho 3n+1