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Trong một quả cầu bằng chì bán kính R, người ta khoét một lỗ hình cầu bán kính R/2

Tìm lực do quả cầu tác dụng lên vật nhỏ m trên đường nối tâm hai hình cầu, cách tâm hình cầu lớn một đoạn d, biết rằng khi chưa khoét quả cầu có khối lượng M.

A. F = G M n 7 d 2 - 8 d R + 2 R 2 8 d 2 d - R 2 2

B.  F = G M n 7 d 2 + 8 d R + 2 R 2 8 d 2 d - R 2 2

C.  F = G M m 7 d 2 - 8 d R + 2 R 2 d 2 d - R 2 2

D. F = G M m 7 d 2 - 8 d R + 2 R 2 4 d 2 d - R 2 2

On hearing that she failed the entrance exam, Trang couldn’t help _______ into tears.

A. bursting

B. burst

C. to bursting

D. to burst 

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

He managed to keep his job _____ the manager had threatened to sack him.

A. Although

B. although

C. unless

D. despite

Carol is wearing a new dress and Helen loves it.
- Helen: “_______”
- Carol: “Thanks. I’m glad you like it. My sister give it to me yesterday.”

A. What a fashionable dress you are wearing!

B. Oh! I like your fashionable dress.

C. I think you have a fashionable dress

D. Your fashionable must be expensive.

Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

His ……………….. of the school regulations really can’t be ignored any longer.

A. carelessness

B. inattention

C. unfamiliarity

D. disregard

Read the following passage and mark the letter A, B, C, or D to indicate the best option for each of the blanks.

Owning a car has several advantages. ___________(27), you can go wherever you want, whenever you want. You don’t have to depend on public transport, and ___________(28), you will feel more independent. ___________(29), you are able to give lifts to friends, or carry heavy loads of shopping. ___________(30), there can be certain financial problems, especially if you live in a city. Running a car can be costly, since you have to spend quite an amount on items___________(31) petrol, servicing the car, and repairs. You might also have problem with parking, as every where is more and more crowded with cars. ___________(32) most people feel that the advantages of owning a car outweigh the disadvantages.

Điền vào ô 27

A. First of all

B. As a result

C. Generally

D. Besides