+ Cho đường tròn (O;R) và dây BC cố định. Trên tia đối của tia BC lấy điểm A. Kẻ các tiếp tuyến AM, AN với đường trong (O) (M và N là các tiếp điểm, N thuộc cung BC nhỏ). Gọi H là trung điểm của dây BC. a) Chứng minh: Tứ giác AMON và tứ giác AOHN nội tiếp. b) Chứng minh AB.AC = AM2. c) Tia MH cắt đường tròn (O) tại điểm thứ hai D. Giả sử ba điểm A, B, C cố định, đường tròn (O) di động. Chứng minh: ND // AC và đường thẳng MN luôn đi qua một điểm cố định.

viết lại câu sao cho nghĩa không đổi ạ 

They come in different shapes and sizes

->They........................................................sizes.( Vary)

Bài1: Cho biểu thức sau a) Rút gọn b) Tìm x nguyên để P nguyên

Fill in each blank with a suitable preposition.

51. My cousin George is obsessed ………………..keeping fit.

52. Many frozen foods are deficient ………………..vitamins.

53. Is that the best idea you can come ………………..with?

54. She’s absolutely ………………..the moon about her new job.

55. We need to keep an eye ………………..the timetable to make sure that production doesn’t slide.

Question 1 :Choose the best answer from A, B, C or D to fill in the gaps.

     1. She speaks Chinese as ………….. as I do

     2. I knew they were talking about me …… they stopped when I entered the room.

      3. The librarian told us not ………… reference books out of the library.

      4. When  I  came to visit her last night , she ………. a bath .

      5. Nobody liked the film,…………….?

      6. Although he loved his country,………………...most of his life abroad.

A. but spent               B. but he spent          C. he spent                 D. so he spent

      7. Many students aren't keen …………….their study at school.

A. about                     B. for                          C. with                        D. on

      8. She hasn't written to me ……………we met last time.

A. before                    B. since                      C. ago                         D. for

9. You can rely ................Jack. He always keeps his promise.

            A. in                           B. for                          C. on                           D. with

10. I will have your car ................soon

          A. repaired                   B. repairing               C.  to repair               D.  being repaired

Question 2: Complete the following sentences with an appropriate form of the word in the brackets. ( 5pts)

1.      They got the ........................ of receiving new bikes.                     (satisfy)

2.      Are there any.................... between Hong and Hoa?                         (similar)

3.      We must make a ……………… about where to go.                       (decide)

4.      All students have great ...................when going to school.              (expect)

5.      ……………, the weather was so bad that we couldn’t go out.        (fortune)

Question 3: Complete the second sentence so that it has a similar meaning to the first sentence. (5 pts)

  1. It was such a boring film that she fell asleep.

The film was ....................................................................................................................

2. I am very pleased that we will meet again soon.

I am looking................................................................................................................

3. Hong couldn't get his parents' permission to buy a computer.                       

Hong’s  parents......................................................................................................

4. "You only think of yourself," she told him.

She accused..........................................................................................................

5. Although her leg hurt, Van finished the marathon race.

In...........................................................................................................................

Help !!