cho mình hỏi sau mỗi từ trong bảng word form mình có thấy kí hiệu "a", nó có nghĩa là gì vậy ?

Cho tam giác ABC vuông tại A. Gọi M là trung điểm AC. Trên tia đối của tia MB, lấy điểm D sao cho MD = MB

a) Chứng minh ΔAMB = ΔCMD

b) Chứng minh AD // BC

c) Từ M, kẻ đường thẳng vuông góc với BC tại H. Chứng minh góc ABC = HMC

(Mình đg cần gấp, ai trả lời sớm mình tick cho)

Her name is Mary. Her character is pretty cute. Her appearance is pretty. She has an oval face, a short but black hair. She also has a pure blue eyes, chubby cheeks attracted many boys do. Mary is very smart and very hardworking. Mary loves to cook. She made time to cook delicious meals for her family.

( Bạn xem đoạn này mình viết có đc ko. Nếu không được thì bạn có thể tự chỉnh sửa lại nha. Chúc bạn học tốt. )

I. Fill each blank with a suitable word:

1. The coffee isn't very sweet. I'll add some ______ sugar.

2. He ____ decided to use less electricity.

3. Do you want to ______ part in a community clean - up program ?

4. You must _____ the truth to your teacher.

5. He had ____ sore throat last month.

6. Mountain climbing is _______ challenging than collecting stamps.

7. Sleeping ______ at the weekend helps us recover ______ a busy week.

8. It is important not to do things that are bad ______ you.

9. She was late _____ of the heavy rain.

10. Ask _____ help if you need.

11. You should ______ more physical actitvities to keep fit.

12. She wants to keep fit, ______ she plays tennis twice a week.

13. I have collected stamps _______ when I was seven.

14. Sitting too _____ to the TV hurts your eyes.

I. Each sentence has a mistake. Find it and correct it.

1. The puppets made of wood and then painted.

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2. Lan writes that letter to do an invitation.

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3. I want to talk for 10 seconds about my favourite hobby.

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4. A good know of English is very useful in our modern life.

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5. Children are made working hard at school and at home as well.

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6. My father works for a volunteer in my country.

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I. Write full sentences using the suggested words and phrases given :

1. We / better / spend / only / one Sunday morning / month / collect / rubbish / beach.

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2. Volunteer / great / way / families / have fun / feel / closer.

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3. mother / never / participate / volunteer activities / before.

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4. It / two years / sister / stay / home / take care / family.

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5. He / like/ share / things / people/ need.

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6. I / begin / work / " Green Summer " / 2001.

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7. It / unhealthy / go out / when / air / full / smoke.

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8. This sauce / often / give / us / strong / stand / cold water.

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9. Quang / hobby / go / surf / summer.

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10. girl / interested / avoid / get / sunburnt.

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I. Fill each blank with a suitable preposition:

1. I like donating money______charitable organizations.

2. Eating more fresh fish has a good effect _____our health.

3. The company has to ______ ways of reducing costs.

4. Our new coach is popular ______ the whole team.

5. Could you move your car ? You're ____ the way of the entrance !

6. ____ entering the room, he found everyone waiting for him.

7. We provided street children _____ evening classes.

8. She takes great pride ____ her work.

9. I was ___ the impression that coach tickets were expensive.

10. You will have to comply _____ these rules.

11. They have difficulty _____ learning English.

12. He was grateful ___ her ____ the good advice.