Vì \(\Lambda ABC\) cân tại A nên \(B=C\)

Xét\(\Delta MDB\) và \(\Delta NEC\) có

\(\begin{matrix}B=C\left(cmt\right)\\BD=EC\left(gt\right)\\MDB=NEC\left(=90^0\right)\end{matrix}\Rightarrow\Delta MDB=\Delta NEC\left(g-c-g\right)\)

\(\Rightarrow MD=NE\) ( 2 cạnh tương ứng)

SUPPLY THE CORRECT VERBS FORMS

1.The stadium (build)………built…………..at the end of this treet 2 years ago

2.When he came, the children (play)…………were playing……………an interesting game

3.I wish Lan (not go)……didn't go………….to class late every morning

4.We’ll have a good time (sunbathe)……to sunbathe……………on the beach

5.Trees (plant)……have planted…………….since it began to rain

6.We (listen)………listened……….to the radio when it stopped (work)……working………..

7.I (not hear)……haven't heard……………..of him since we last met

8.May Day (celebrate)………celebrates………………in almost every country around the world

9.Paper money (use)……has used………….for a thousand years

10.He (serve)……served……..in the army from 1960 to 1969

11.It started to rain while you (sleep)………was sleeping…………….

12.They are eager (take)………taking………..the trip to France

13.The doctor (be)…………have been ……..here since 7 o’clock

14.Four films (make)……have made……….by Michal so far

15.The weather (turn)……turns…………..hot in April

16.Are they used to (swim)…………………..in the sea?

17.Someone made the boy (stay)……staying……..in that room

18.If I lived here, I (visit)……would visited………..you more often

19.The postman (come)……came…………..when I was working in the garden

20.He (not be)………haven't been………here since Christmas, I wonder where he (live)……have lived…………since then

21.The door bell rang while I (read)………was reading……………….a book

22.When I came, the house (paint)………was painting………………..

23.When the accident happened, we (sit)……was sitting…………….in a café

24.We cant break past records without (train)……training………..hard

25.That book (write)………wrote………….in 1980

26.This book must (return)………be returned………….to the library tomorrow

27.It takes me ten minutes (drive)………to drive…………….to work

28.It sometimes may be difficult (get)……to get…………..a taxi during rush hour

29.Where’s Mai? We (wait)……are waiting………….for her for 2 hours now

30.Our school (build)………will be built………….here next year

31.Tam is not good at (repair)………repairing…………….things

32.When we got to the hospital, she (wait)………was waiting…………..in the waiting room

33.If he (know)………knew…………..what you are doing, he would be very surprised

34.The boy stopped (play)……………playing……….because of the sudden rain

35.He (join)………would join………….us if he finished his report

36.Nga’s father had her bike (repair)……be repaired…………….

37.They got the boy (take)……taking………the box upstairs

38.They advised us (not go)……not to go………..out alone at night

39.We will have her (clean)…………………..the room tomorrow

40We had our house (repaint)……be repainted………….last month

41.I was really amazed (see)………………….that she failed the exam

42.Would you mind (help)………to see………me with this work?

43.Do you smell something (burn)……burning………………in the kitchen?

44.Did the film make you (cry)………cried…………?

45.Tourists could see fish (swim)……swimming………..along the brook

46.The lady wants the waiter (bring)…to bring…………….her some suger

47.I (play)…………have played……….soccer since I (be)…………….a child

48.He (feel)……felt………..happy when he heard the news

49.yesterday the storm (not make)……didn't make…………..the tourists (delay)………to delay………their journey

50.They (dicuss)………have dicussed………..the use of paper when we got into

51.That story (translate)………translated…………………in English 2 years ago

52.Milk (use)…………is used…………..to make butter and cheese

53……Have……….you ever (hear)……heard………………such a story?

54.My mother asked me (not drive)……not to drive……….so fast

55.She was afraid of (tell)……telling………her parents the truth

56.The question was too hard for him (answer)………to answer………..

57.Nothing could prevent him from (go)………going………….there

58.They have finished (paint)……painting………………our apartment at last

59.Books used to (write)………write…………..by hands

60.A new film (show)……was showed……………on Tv last night

61.I really hate (be)……being…………late for the appointment

62.Mother requested her daughter (not come)………not to come………….back home late

63.Why don’t you have your eyes (test)………teasting………….

64.This room (paint)………have painted……………….since I (be)…was………….here

65.She (give)………has given………..alot of money by her father recently

66.My uncle was watering the flowers when I (arrive)……arrived…………….

67.I am ired of (meet)……meeting………………..the same people everyday

68.Could you go swimming if you (have)………had……..time?

69.The children often spend much time (watch)…………watching………..TV

70.They saw the mother bird (feed)………to feed……….her baby

71.Rivers usually (flow)……flow……….to the sea

72.Do you know that man who (smoke)………smoke………..there?

73.When the alarm rang, Minh (jump)……was jumped……….out of bed quickly

74.I saw a bad accident while I (wait)……was waiting…………..for you on this corner

75.At 4 PM yesterdayWell, I (work)………worked…………………..in my office

76.When we (see)………see……..Mr Phong tomorrow, I (remind)………will remind………..him of that

77.The war (break)…was broken………….out 3 years ago

79.At present, that author (write)………is writing……………………..a historical novel

80.Light (travel)……travelling…………….faster than sound

81.The children were frightened because it (get)………got…………………dark

82.I (find)………found…………..this old photo when I was looking for my passport

1. Farmers/have/few/days off/workers.

\(\Rightarrow\)...The farmers have less days off than the workers ...........

2. Mr. tan usually/start/work/seven a.m/morning/and/finish/5p.m

\(\Rightarrow\)....Mr.Tan usually starts working at seven a.m in the morning and finishes at 5p.m..................................

3. What/you/do/Thanksgiving Day?

\(\Rightarrow\)...What do you do on Thanksgiving Day?..........................................................

4. We/usually/have/party/home

\(\Rightarrow\)..We usually have a party at home...........................................................

5. They/usually/spend/time/families/Christmas Day

\(\Rightarrow\).They usually spend time with their families on Christmas Day...................................................................

6. After/work/farm/he often/clean/chicken coop/and/collect eggs

\(\Rightarrow\)..After working on the farm, he often cleans the chicken coop and collects eggs..................................................................................

7. How many/public/vacations/year/Vietnamese students/have/?

\(\Rightarrow\).How many public vacations a year do Vietnamese students have?.................................................................................

8. We/less work/and/more/money/spend/future

\(\Rightarrow\).. We will have less work and more money to spend in the future ....................................................................................................

Vi Thi Kim Quy

so be la: 445

so lon la:557

de qua di a tra phai tinh gi ca

PERIOD 1: PRACTICE AFTER UNIT 1: LEISURE ACTIVITIES

I. Choose the word whose underlined part is pronounced differently from that of the others

II. Choose the best answer to fill in the blank.

III. Fill each blank with a word/ phrase in the box.

IV. Read the following passage, and choose the best answer for each blank.

Leisure in Britain

The British spend their free time in different ways. People generally use it to relax. But many people also (1) _____________ voluntary work, especially for charities.

People spend a lot of their free time in the home, where the (2) _______ popular leisure activity is watching television, the average viewing time being 25 hours a week. People often (3)______ programs on video so that they can watch later, and video rental shop.

Reading is also a favourite way of spending leisure time. The British spend a lot of time reading newspapers and magazines.

In the summer gardening is popular, and in winter it is often replaced by “do-it-yourself”, (5)________people spend their time improving or repairing their homes. Many people have pets to look after: taking the dog for a daily walk is a regular routine.

The extra leisure time (6) _____ at the weekends means that some leisure activities, many of them to do with sport, normally (7)_________place only then. Traditional spectator sports include football, cricket, horse racing, motor racing and motor cycle racing. Popular forms of (8) ______ are swimming, tennis, ice-skating or roller skating, cycling, climbing, and hill or country walking.

Families often have a “ day out” at the weekend, especially in summer, with a (9) _______ to a local event such as a festival, fair or show. Young people especially go to clubs and discos, while people of all (10) ________ go to the theatre, the cinema, art exhibitions and concerts.

A. make B. do C. play D. go

A. many B. more C. much D. most

A. record B. scan C. print D. power

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

A. what B. why C. when D. while

A. available B. probable C. abundant D. exclusive

A. drag B. bring C. carry D. take

A. strength B. exercise C. athletics D. presentation

A. voyage B. journey C. visit D. road

A. ages B. numbers C. years D. groups

A ) x=1 b) x=0 hoăc =1 c) x=194.5

1) Tại sao vào buổi trưa khi đi trên đường nhựa, nhìn về phía trước ta thấy mặt đường như có 1 vũng nước nhưng lại gần thì không phải?

_ _ _ _ _ _ _ _ _

Vào thời điểm đó mặt đường (nhất là đường nhựa) hấp thụ ánh sáng mặt trời mạnh nên rất nóng. Lượng nhiệt này sau đó bức xạ trở lại làm nóng những lớp không khí trên mặt đường.

Lớp không khí càng gần mặt đường càng bị đốt nóng và sẽ bị giãn nở, chiết suất giảm. Vì vậy, tia sáng từ một vật thể ở xa như ôtô, xe máy sẽ bị khúc xạ nhiều lần qua những lớp không khí có chiết suất khác nhau và có xu hướng bẻ cong thoai thoải xuống mặt đường. Đến một lúc góc tới của tia sáng vượt qua giá trị của góc khúc xạ tới hạn sẽ xảy ra hiện tượng phản xạ toàn phần.

Lúc này tia sáng bị phản xạ lên phía trên và truyền đến mắt, khiến chúng ta thấy bóng lờ mờ của vật thể phía trước thấp thoáng trên mặt đường. Cùng với đó là hiện tượng đối lưu không khí làm chúng ta có cảm giác như ở phía trước có vũng nước và hình ảnh dao động thấp thoáng.

2) Vì sao gương cầu lõm thường dùng làm pha đèn ô tô, đèn pin?

_ _ _ _ _ _ _ _ _

Vì gương cầu lõm có tác dụng biến đổi chùm tia tới phân kì thành chùm phản xạ song song nên người ta dùng gương cầu lõm làm pha đèn ô tô, đèn pin để giúp ánh sáng truyền từ đèn đi xa mà vẫn rõ

3/ Vì sao trong nhà hát người ta thường treo rèm nhung làm tường sần sùi?

_ _ _ _ _ _ _ _ _ _

Vì trong những nhà hát thì chúng ta cần không gian yên tĩnh mà những vật như tường sần sùi, rèm nhung là những vật hấp thụ âm tốt để giảm tiếng vang, âm nghe rõ hơn

4/ Tại sao khi bay côn trùng thường phát ra tiếng vo vo?

_ _ _ _ _ _ _ _ _ _ _ _

Do đôi cánh nhỏ của chúng vẫy rất nhanh tạo ra dao động và phát ra âm thanh nên ​khi bay côn trùng thường phát ra tiếng vo vo​.​

5/ Tại sao khi con chim bay, cánh chim dao động nhưng ta không nghe được âm thanh nó phát ra?​

_ _ _ _ _ _ _ _ _ _ _ _

Vì âm của cánh con chim đang bay có tần số nhỏ hơn 20 Hz​nên khi con chim bay, cánh chim dao động nhưng ta không nghe được âm thanh nó phát ra