i/ remember/ have/ so/fun/ love/ your family/ stay / ohio/exchange student

British families started going (0) ______ holiday to the seaside around the middle of the 19^th century. The invention of the railways (1) ______ this possible. The first holidaymakers were quite rich and went for their health and education. The seaside was a place to be (2) ______ of illness, and doctors recommended bathing in the sea and drinking sea water. Also to (3) _____ their knowledge, families attended concerts and read books from the library.

At that time, ordinary working people had a very little time (4) _______ work. However, in 1871, the government (5) ______ for ‘Bank Holidays’- national holiday days. This (6) _____ people to have a day or two out, which (7) _______ gave them a (8) ______ for leisure and the seaside. At first, they went on day-trips, taking (9) ______ of special cheap tickets on the railways.

By the 1880s, rising incomes (10) ______ that many ordinary workers and their families could have a week’s holiday at the seaside. Rail fares were reduced and cheap hotels were built to (11) ______ them. Holidaymakers enjoyed being (12) ______, sitting on the beach, bathing in the sea, and eating ice-cream. Cheap entertainment was (13) ______ offer and holidaymakers went to (14) _______fun.

Today, the English seaside (15) ______ popular, with more than 18 million holidays taken there each year.

0.      A. for                          B. to                            ©. on                         D. at

1.      A. let                          B. made                      C. got                         D. dad

2.      A. cured                     B. remedied               C. recovered             D. improved

3.      A. raise                       B. spread                    C. increase                D. add

4.      A. out                         B. off                          C. away                      D. from

5.      A. installed                B. presented              C. introduced            D. brought

6.      A. allowed                 B. provided               C. offered                  D. opened

7.      A. hardly ever           B. here and there      C. seldom                  D. now and then

8.      A. taste                       B. sense                      C. favour                   D. pleasure

9.      A. benefit                   B. opportunity          C. advantage             D. profit

10. A. caused                   B. produced               C. meant                    D. resulted

11. A. accommodate       B. board                     C. cater                      D. lodge

12. A. idle                        B. easy                       C. restful                    D. spare

13. A. in                           B. for                          C. to                           D. on

14. A. get                         B. have                       C. take                        D. make

15. A. remains                 B. stays                      C. continues              D. lasts

There can be very few people who have not read about the (1) _______________ of the rainforests, and (2) ________________ still would say that nothing should be done. However, the idea that this could be achieved by (3) ________________ developing countries is a highly dubious proposition.

        It’s often suggested that the industrialized countries of the world have worked hard to limit population. To a certain (4) ________________ extent, there’s some (5) ________________  in this, and measures have been taken to stop the increase in CFCs and other ozone-destroying gases: some cars are fitted with catalytic converters, (6) ________________ is commonplace and lead-free petrol is widely (7) ________________. However the (8) ________________ that we in the West are doing something to combat pollution whereas the (9) ________________ world is not an oversimplification. We are continuing to pour billions of tons of (10) ________________ into the atmosphere every year.

1. DESTROY 2. FEW 3. PRESSURE 4. LIMIT 5. TRUE 6. RECYCLE 7. AVAIL 8. IMPLICATE 9. DEVELOP 10. POLLUTE

turn off          look for         look after      see off            cut off

succeed in     look up           take over       come across

0.      After trying an hour she finally succeeded in starting the car.

1.      Don’t forget to ___________ _____ all the lights before going out.

2.      If you don’t pay your electricity bill soon, you will be ___________ _____.

3.      When the company was ___________ ______, the new bosses made a lot of people redundant.

4.      If you’re not sure how to use a phrasal verb, _____________ it _______ in the dictionary.

5.      I think they’ve gone to the airport to _____________ their boss _______.

6.      When I was cleaning the attic yesterday, I ___________ _____ a skeleton.

7.      I’ve lost my keys. Can you help me _____________ ____ them?

8.      Could you please _____________ _____ my house and pets when I am away on holiday next month?

một dây tóc bóng đèn làm vằng vonfram ở nhiệt độ trong phòng có điện trở 40W, có tiết diện tròn đường kính 0,04mm. Hãy tính chiều dài của sợi dây tóc bóng đèn, biết điện trở suất của Vonfram                 r = 5,5.10^-8 W.m.                                                                                                                                              

một điện trở con chạy được quấn bằng dây hợp kim nicrôm có điện  trở  suất  r = 1,1.10^-6   W.m, đường kính tiết diện d = 1mm, chiều dài dây là 50 m. Tính điện trở lớn nhất của biến trở:

Tính điện trở của một dây dẫn bằng nikêlin dài 30m, tiết diện 0,5mm². Điện trở suất của nikêlin là 0,4.10^-6W.m.

câu 1:  a. cho 2 điện trở R₁ = 20, R₂ = 30 mắc nối tiếp vào mạch điện có  hiệu điện thế U = 24V. Hãy tính điện trở tương đương của mạch,  cường độ dòng điện qua mỗi điện trở.

b. Vẫn mạch điện như trên, người ta mắc thêm R₃ = 15 song song với R₁. Hãy tính điện trở tương đương của mạch, cường độ dòng điện chạy qua R₃.