Cho tam giác ABC cân tại A, trên tia đối của tia AB, lấy điểm M, từ M kẻ đường thẳng // BC cắt tia CA tại N, chứng minh:

a, tam giác OMN cân, từ đó suy ra OM=ON

b, AD=BC

c, MNBC là hình thang cân

Cho tam giác ABC cân tại A, lấy M thuộc AB, N thuộc AC, so cho MN=BC. Chứng minh:

a, MNCB là hình thang cân
b, MB=NC, MC=NB

helpppp

giúp tớ bài này đc ko ạ?

genius/ bright /stupid/ slow /fool/ brilliant
38. Our Professor is considered to be one of the world’s most .................................... physicists.
39. Our daughter was a very .................................... child. She was reading before she was five.
40. You drove home after drinking all night! How can you be so ....................................?
41. I don’t really understand what you’re getting at. Sorry if I’m being a bit ....................................
42. Salvador Dali might have been very strange, but you have to admit the man was a ...........................
43. He lost all his money in some crazy business deal. The man’s a complete ....................................

giúp tớ với

Underline the correct answer.
1. When I was a child, we often used / would often sit in the garden on summer evenings.
2. As soon as she put the phone down, she started / had started to cry.
3. I used to / would own a house in the country but I sold it.
4. We waited until we had finished work and then we took / had taken a break.
5. They didn’t used to live / weren’t used to living in a flat but they don’t mind it now.
6. It was now evening and we were driving / had been driving all day.
7. Where did you use to / would you work before you got this job?
8. Giles and Max used to argue / were used to arguing but they get along fine now.

III. Put the verbs in brackets into a correct tense.
A Last summer I (0) ...visited..., (visit) the United States. I ............................................. (17. look
forward) to the trip for ages, and I ............................................. (18. enjoy) myself very much.
On the 4th of July a friend ............................................. (19. suggest) we go and watch the
fireworks. I ....................................... (20. see) fireworks before, but I .................................
................................. (21. never / experience) anything like the spectacle we ...........................
................................. (22. witness) that night.
B This time next week I ............................................. (23. be) on my honeymoon and I
............................................. (24. forget) all about my problems at work. My husband and I
....................................... (25. relax) by the pool and we ............................................. (26.
look forward) to spending romantic evenings together.
C Peter .................................... (27. drive) to work yesterday when a dog .................................
................................. (28. run) into the middle of the road. Peter .......................................
(29. manage) to stop in time but the car which ....................................... (30. follow) behind him
....................................... (31. crash) into the back of his car. Then the two cars .....................
................................. (32. collide) with a police car which ................................. (33. travel)
in the opposite direction.

Complete the second sentence so that it means the same as the first, using the word in bold. Use between two and five words.
9. We were getting ready to leave when we got the call. about
We .............................................................................................. when we got the call.
10. Avril is leaving her job very soon. point
Avril .............................................................................................. is her job.
11. According to the schedule, the project will finish next year. due
The project .............................................................................................. next year.
12. You must not write on the question paper. are
You ........................................................................................... on the question paper.
13. When are they going to get married? plan
When .............................................................................................. married?
14. I had arranged to meet Liz for lunch but she cancelled. meeting
I ..................................................................................... Liz for lunch but she cancelled.
15. I was about to ring you when you rang me. going
I .............................................................................................. you when you rang me.
16. We expected to see them at the concert. would
We thought we .................................................................................. them