They may use this room for the classroom .

-> This room may be used for the classroom.

Vì số lần sinh nhật của 2 bố con = nhau nên ngày sinh nhật của bố là 29/2

Vậy số tuổi của bố là:9*4=36(tuổi)

LÀ 15 HÌNH CHỮ NHẬT

Bài 1: Cho đoạn AB có O là trung điểm. Trên nửa mặt phẳng bờ AB vẽ Ax, By vuông góc với AB. Trên Ax, By lấy C, D sao cho góc COD = 90\(^0\). Kẻ OH vuông góc với CD.
a. Chứng minh H thuộc đường tròn đường kính AB.
b. Xác định vị trí CD với đường tròn O.
Bài 2: Cho đường tròn (O;5). Điểm M nằm ngoài (O) sao cho qua M kẻ được 2 tiếp tuyến MA, MB thỏa mãn MA vuông góc MB ( A, B là tiếp điểm ). Từ C thuộc cung AB nhỏ kẻ tiếp tuyến với (O) cắt MA, MB tại P, Q.
a. MABO là hình gì? Vì sao?
b. Tính chu vi tam giác MPQ.
c. Tính \(\widehat{POQ}\)

có 10 quả dâu

1. she often wore jeans when she was young.

=>She used to wear jeans when she was young.

2. he is not a poor man any more.

=> He used to be a poor man.

3. Nga enjoys listening to traditional stories.

=>Nga is interested in listening to traditional stories.

4. she doesn't have money to buy this car. (rich)

=> She isn't rich enough to buy this car.

5. you should not stay up so late in the evening.

=>you had better not stay up so late in the evening.

6. My parents didn't let me go out in the evening.

=> My parents didn't allow me to go out in the evening.

7. Sarah needs to improve her English.

=>Sarah's English needs to be improved.

8. We are going to teach our students some new English words tomorrow.

=> Some new english words are going to be taught our students tomorrow.

10. ''what did you do yesterday?'' her friend asked.

=>Her friend wanted to know what I had done the day before.

II.Give the correct form or tense of verbs.

1. Jane saw her old friend while she (cross) was crossing the stress.

2. He had his father (decorate) decorated his Christmas card yesterday.

3. I saw him (water) watering the flowers in the garden.

4. Paul is said (be)to be the brightest student in the class.

5. The poem which (write) was written by Clement Clarke Moore, become popular in the USA.

6.When he realized I (look) was looking at him, he (turn) turned away.

7. It was late, so we decided (take) to take a taxi home.

8. We were hungry, so I suggested having (have)dinner early.

9. When I'm tired, I don't enjoy being questioned (question)by other people.

1. Nothing can change my mind
=> My mind can't be changed.

2. No one had told me about it
=> I hadn't been told about it.

3. I don't know her telephone number
=> Her telephone number isn't known by me.

4. My students will bring the children home

=> The children will be brought home by my students.

5. They sent me a present last week
=> I was sent a present last week.

1. She gave us more information
=> We were given more information by her.

2. The chief engineer was instructing all the workers of the plan
=> All the workers of the plan were being instructed by the chief engineer.

3. They can't make tea with cold water
=> Tea can't be made with cold water.

4. Somebody has taken some of my books away
=> Some of my books have been taken away.

5. They will hold the meeting before May Day
=> The meeting will be held before May Day.

cái chai 

2 / 12 ngày