Kể tên những chiến dịch lớn của quân dân ta trong cuộc kháng chiến chống thực dân Pháp  (1946 – 1954). Chiến dịch nào có ý nghĩa quyết định thắng lợi của cuộc kháng chiến chống thực dân Pháp xâm lược (1945-1954)?

cần gấp

Bài 1. Đặt một vật sáng AB, có dạng một mũi tên cao 2cm, vuông góc với trục chính của một thấu
kính hội tụ và cách thấu kính 6cm. Thấu kính có tiêu cự 3cm
a) Hãy dựng ảnh A’B’của vật AB theo đúng tỉ lệ xích và nêu đặc điểm ảnh.
b) Tính khoảng cách từ ảnh tới thấu kính và chiều cao của ảnh A’B’
 

  Bài 2. Có 4 lọ mất nhãn đựng 4 dung dịch sau: Rượu etylic, axit axetic, glucozơ và dầu ăn tan trong nươc. Bằng phương pháp hoá học hãy nhận biết 4 dung dịch trên. Viết phương trình (nếu có).

Exercise 2: Rewrite the following sentences so that the second sentence means exactly the same as the sentences before it.

1. That man used to work with me when I lived in New York.

   That’s the man _______________________________________________________________

2. It was raining, so we decided to postpone the football match.

   Since _______________________________________________________________

3. I think it would be a good idea to take the train.

   I suggest _______________________________________________________________

4. She couldn't join us because she was busy.

   She was busy, _______________________________________________________________

5. The flowers were roses. I bought the flowers for my sister.

   The flowers _______________________________________________________________

6. She can't work hard because she is very old.

   Because of _______________________________________________________________

7. He couldn't meet you because of being busy.

    Because _______________________________________________________________

8. We must finish the project on time.

   The project _______________________________________________________________

9. He started working as an engineer for this company 5 years ago.

   He has _______________________________________________________________

10. What about organizing a charity event to raise money?

  I suggest we _______________________________________________________________

11. Stop littering or our school will be full of rubbish.

    If we don’t _______________________________________________________________

12. He stopped working at school, but he still taught street children.

    Although _______________________________________________________________

13. He is a careless driver, so he has caused a lot of accidents.

   He drives _______________________________________________________________

14. I am fond of listening to folk music.

   I enjoy _______________________________________________________________

15. We usually spent two hours a day learning English.

   It took _______________________________________________________________

Exercise 1: Combine two sentences, use the word in brackets

1. We don’t know much about tennis rules. We like to play it.  (however) 

_______________________________________________________________

2. I bought a new computer. It cost me a lot of money.  (which)

_______________________________________________________________

3. The girl is very friendly . She lives next door. (who)

_______________________________________________________________

4.It was a beautiful day. We decided to go out. (so)

_______________________________________________________________

5. Nam always gets bad marks. He is very lazy.  (because)

_______________________________________________________________

6. He loves humorous stories. He doesn’t like ghost stories. (but)

 _______________________________________________________________

7. I don’t understand you. You speak very quickly. (if)

_______________________________________________________________

8. It rained heavily. My father went to work on time. (although)

_______________________________________________________________

9. There is a storm coming. We decide to postpone our camping. (therefore)

_______________________________________________________________

10. We use cars all the time. We pollute the air. (if)

_______________________________________________________________

26. I always drive more ________________ at night. (careful)

27. Air and water __________________ can make people fall ill. (pollute)

28. I look forward to ___________________ good responses from your company. (receive)

29. This is the most _________________ collection of paintings that t’ve ever known. (value)

30. He was ___________________ that they were not coming. (disappoint)

31. Mr Brown is one of the   __________________ (conserve)

32. One of the most important ________________ for Vietnamese people is Tet or the Lunar New Year holiday. (celebrate)

33. New Year’s Day is a national _____________, so people don’t have to go to work. (festive)

34. The streets are filled with a _____________________atmosphere when Christmas day comes. (joy)

35. Thousands of people have been made _______________ by the flooding and are in need of food, clothing and shelter. (home)

36. It was a frightening sight for Pliny to see the volcanic _____________________ of Mr. Vesuvius. (erupt)

37. The mountain was full of ___________________ rock and ash when the eruption was over. (volcano)

38. When the fire occurred, I was fast _____________________ (sleep)

39. ____________________ Vietnam is often affected by droughts. (centre)

40. Mr. Robinson is a _________________. He presents weather reports on TV every night. (weather)

Theo em, thuế có vai trò gì đối với sự phát triển kinh tế - xã hội của đất nước?