Mắc R₁ vào hai điểm A,B của mạch điện thì I  = 0,4A. Nếu mắc song song thêm  một điện trở R₂ = 10Ω mà I’= 0,8A thì R₁ có trị số là:

1 I love going to this place _____________ it’s the quietest place in the city.

A. so                B. though                     C. so that                     D. as

2. They keep changing the decoration of the shop ___________ they can attract more young people.

A. so that                     B. because                   C. although                 D. when

3. _____________ she’s young, she’s the most famous artisan in the village.

A. When                       B. Although                 C. Whereas                  D. In order to

4. You should say goodbye to your brother _____________ you leave for Europe.
A. despite                    B. after                                                C. since                       D. before
5. _____________ you study harder, you won’t win the scholarship.
A. Unless                    B. Because                              C. If                            D. In order that
6. We will wait her ____________ he comes back.
A. while                      B. until                                                C. since                       D. for
7. ________________ she spoke slowly, I couldn’t understand her.
A. Since                      B. Although                            C. If                            D. As

8. He tries his best to work hard ______________ help her family get over the difficulties.
A. so as that                B. in order that                                    C. in order to               D. so as not to
9. I made a mistake ____________ I was tired after the work.
A. though                    B. so that                                 C. because                   D. if
10. Our teacher explained the lesson slowly ______________ we could understand him.
A. and                                     B. so that                                 C. if not                       D. or 

11. My sister will take the plane to Singapore______________ she dislikes flying.
A. because                   B. so that                                 C. therefore                 D. although
12. They asked me to wait for them; ____________, they didn’t turn back.
A. but                          B. however                              C. so                            D. therefore

13. They were walking on the street _________ there was an accident.
A. when                      B. while                                   C. because                   D. so that
14. She stopped at the post office ___________ she could send the letter to her parents.
A. although                 B. so as to                               C. in order that                        D. despite
15. What had you done ____________ I phoned you?
A. as soon as               B. by the time                                     C. after                                    D. while
16. He didn’t wear warm clothes __________________ the cold weather in winter.
A. because                   B. although                             C. because of              D. in spite of
17. She didn’t join our programme _________________ she had to take a summer course at the college.
A. so that        B. because of                          C. because       D. although

18. John succeeded in the exam ______________ his hard and methodical work.
A. because                   B. in spite of               C. because of              D. although

19. You can take Chemistry as your major.______________, you should remember that it is not easy to learn.
A. Therefore                B. But                                     C. However                 D. Although

20. She has driven a car _____________ she studied at the university.
A. as soon as               B. by the time                         C. after                                    D. since

The restaurant does its best to serve the guests ______________. (quick/ more quick /quickness/ quickly) *

làm và giải thích giúp mk a

9. There was no in continuing for him the race was over.
A. value B. worth C. point D. profit

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10. a large number of the country’s crafts villages are suffering from a
shortage of human resources and difficulties in building brand recognition, many
international organizations have had projects to help them.
A. Even B. Although C. However D. But
11. Vietnamese traditional is done with a simple hammer and chisel.
A. sculptured feature B. sculptor
C. sculpture pieces D. sculpture
12. This cloth very thin.
A. feels B. touches C. holds D. handles
13. It was only he told me his surname that I realized that we had been to
the same school.
A. until B. when C. since D. then

14. a majority of Vietnamese small and medium enterprises do not have in-
house designers or specialized design staff, they have to hire freelance

designers.
A. While B. Since C. Due to D. Despite the fact
15. Now, at the age of over 80, the artisan is leaving the craft to his descendants
with the desire to this ancient craft.
A. change B. consider C. preserve D. reserve
16. For that artisans, making the paintings is a career it supports the life of
many generations of the family.
A. because of B. although C. so that D. because
17. The four-ton statue of hero Tran Vu, in 1667, still stands in Quan Thanh
Temple.
A. to cast B. to be vast C. cast D. casting
18. Her business must be going rather well, by the car she drives.
A. deducing B. deciding C. inferring D. judging
19. I’m afraid this vase is anything but antique - In fact, it’s .
A. pointless B. worthless C. meaningless D. hopeless
20. He couldn’t his father that he was telling the truth.

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A. admit B. confide C. trust D. convince
21. Tom wakes his parents up .................... playing the guitar very softly.
A. because B. in spite of C. because of D. although
22. ________she was very hard working; she hardly earned enough to feed her

family.
A. In spite of B. Because C. Because of D.Although
23. I went to the club last Saturday ________the heavy rain.
A. because of B. because C. in spite of D. though
24. Despite the fact that it rained, we enjoyed our trip.
A. Because of the rain B. Though it is raining
C. Despite of the heavy rain D. Though it rained
25. Although he is very old, he can walk to the station.
A. In spite of his old age B. Despite his old age
C. Despite the fact that he is old D. All are correct
26. The boy can’t reach the shelf __________ he’s not tall enough.
A. because B. although C. even though D. and
27. Nam failed the final exam _________ he was lazy.
A. while B. though C. because D. but
28.We didn’t go for a walk _________it was very cold.
A. though B. because C. but D. so
29. I’m learning English _________ I want to get a better job.
A. or B. because C. therefore D. but
30. Lan couldn’t pass the exam _________ she is too lazy.
A. because B. because of C. although D. in spite of
31. Many people believe him ._______he often tells a lie.
A. because B. in spite of C. although D. because of
32.______ her poverty, she feels happy.
A. Although B. Because C. If D. In spite of
33.In spite of his hard work, he could not finish the job.
A. As hard as he work B. Despite he worked hard

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C. Though he worked hard D. Although hard work
34. Tom went to work although he didn’t feel very well.
A. that he did not feel very well B. despite of the fact not feeling well
C. because he did not feel very well D.d espite not feeling very well
35. I have tried hard but I can’t earn enough money.
A. Although I have tried hard, but I can’t earn enough money.
B. Although I have tried hard, I can’t earn enough money.
C. In spite of I have tried hard, I can’t earn enough money.
D. Despite I have tried hard, but I can’t earn enough money.
36. She couldn’t unlock it _________ she had the wrong key.
A. while B. but C. though D. because
37. We watched TV the whole evening ________ we had nothing better to do.
A. because B. though C. so D. but
38. They decided not to go out for a meal _______they were too tired.
A. so B. because C. but D. if
39. Last night we came to the show late ______ the traffic was terrible
A. although B. despite C. and D. because
40._____ his broken leg, he didn’t come to class yesterday.
A. Because B. Because of C. Despite D. So
41. I almost missed my flight there was a long queue in the duty-free shop.
A. although B. since C. despite D. because of
42. I want to be well-groomed other people think nice things about me.
A. in order to B. so as not to C. so that D. as soon as
43. she is young, she is very independent.
A. Although B. Because C. In order that D. In spite of
44. I met the Gills, I had been gardening for nearly ten years.
A. As soon as B. Although C. After D. Before
45. he had finished his studies, he went to America.
A. While B. Before C. After D. Until
46. You’ll never guess what happened I left my room.

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A. as long as B. as soon as C. while D. as far as
47. they’re expensive, they last forever and never go out of style.
A. When B. As soon as C. Even though D. Because
48. She went back to live with her mother she did not earn enough money
to live in her own house.
A. although B. so that C. in order to D. because
49. They were driving to Dallas they caught an accident.
A. when B. while C. before D. as soon as
50. she was asleep, thieves broke in and stole her handbag.
A. In order that B. Although C. Because of D. While