Exercise 1: Choose the best answer to complete these following sentences.

1. He got wet_______ he forgot his umbrella.

A. because of B. because C. but D. and

2. He stops working _______ heavy raining.

A. in spite of B. although C. despite D. because of

3. They have a lot of difficulties in their life _______ their poverty.

A. in spite of B. although C. because D. because of

4. Tom wakes his parents up_______ playing the guitar very softly.

A. because B. in spite of C. because of D. although

5. Nobody could hear her_______ she spoke too quietly.

A. although B. because C. because of D. in spite of

6. We decided to leave early _______the party was boring.

A. although B. despite C. because D. because of

7. Many people believe him__________ he often tells a lie.

A. because B. in spite of C. although D. because of

8. _______she was very hard working; she hardly earned enough to feed her family.

A. In spite of B. Because C. Because of D. Although

9. _______her absence from class yesterday, she couldn’t understand the lesson.

A. Although B. In spite of C. Because of D. Because

10. ______her poorness, she feels happy.

A. Although B. Because C. If D. In spite of

11. We all feel sad _______ the bad news

A. because B. because of C. though D. despite

12. John lost his job__________ his laziness.

A. because of B. because C. in spite of D. though

13. I went to the club last Saturday________ the heavy rain.

A. because of B. because C. in spite of D. though

14. He has had this car_________ six months.

A. in B. since C. during D. for

15. We can't go to Julia's party _______ we're going away that weekend.

A. because B. because of C. although D. in spite of

16. ____ repeated assurances that the product is safe; many people have stopped buying it.

A. By B. Despite C. With D. For

17. She walked home by herself, _______ she knew that it was dangerous.

A. because B. although C. and D. but

18. _______ his injuries, he bears no animosity towards his attackers.

A. Because of B. But for C. In spite of D. Without

19. I'll see you after the show and give you £20 for the tickets, or _______ much they cost.

A. whatever B. nevertheless C. besides D. however

20. Mai worked hard, ______ she passed her exam.

A. so B. although C. because D. though

Exercise 2: Choose the best answer to complete these following sentences.

1. _____ she was very tired, she helped her brother with his homework.

A. Because B. whether C. Although D. so

2. It’s raining hard, _____ we can’t go to the beach.

A. or B. but C. so D. though

3. Nam was absent from class yesterday ____ he felt sick.

A. so B. because C. although D. but

4. Tom has a computer, _____ he doesn’t use it.

A. or B. as C. because D. but

Bài tập cụm từ và mệnh đề chỉ mục đích

1. He left home early _________ he could arrive at the station on time.

A. because of B. in order to C. although D. so that

2. He works hard_________ help his family.

A. so as that B. in order to C. in order that D. A and B are correct

3. She turned down the radio so that she wouldn’t disturb the neighbors.

A. She turned down the radio so as not to disturb the neighbors.
B. She turned down the radio in order not to disturb the neighbors.
C. She turned down the radio in order that she wouldn’t disturb the neighbors.
D. All are correct.

4. He gave me his address. He wanted me to visit him.

A. He gave me his address so as to visit him.
B. He gave me his address for me in order to visit him.
C. He gave me his address in order for me to visit him.
D. He gave me his address in order to for me visit him.

5. He studies hard. He doesn’t want to fail in the exam.

He studies hard _________fail in the exam.

A. not to B. so as not to C. in order to D. so that

6. Mary jogs everyday ________ lose weight.

A. so she can B. so that she can C. because she can D. so that to

7. You shoud look up the meaning of the new in the dictionary _______ misuse it

A. so as to B. to C. so as not to D. so that

8. He lighted the candle ________ he might read the note.

A. so that B. and C. because D. as a result

9. He turned off the lights before going out _______ waste electricity.

A. so that not B. as not to C. in order that not D. so as not to

Làm vậy để bạn ấy rút kinh nghiệm và làm gương cho các bạn khác :))

Hay quá thầy ơi :))

Đặt A = 2.2² + 3.2³ + 4.2⁴ + ... + n.2ⁿ

2A = 2.2³ + 3.2⁴ + 4.2⁵ + ... + n.2ⁿ⁺¹

2A - A = (2.2³ - 3.2³) + (3.2⁴ - 4.2⁴) + ... + [(n-1).2ⁿ - n.2ⁿ] + n.2ⁿ⁺¹

A = -2³ - 2⁴ - ... - 2ⁿ + n.2ⁿ⁺¹ - 2.2²

A = n.2ⁿ⁺¹ - (2³ + 2⁴ + 2⁵ + ... + 2ⁿ) - 2³

Đặt B = 2³ + 2⁴ + ... + 2ⁿ

2B = 2⁴ + 2⁵ + ... + 2ⁿ⁺¹

2B - B = 2⁴ + 2⁵ + ... + 2ⁿ⁺¹ - 2³ - 2⁴ - 2ⁿ

B = 2ⁿ⁺¹ - 2³

Mà A = n.2ⁿ⁺¹ - (2³ + 2⁴ + 2⁵ + ... + 2ⁿ) - 2³

=> A = n.2ⁿ⁺¹ - B - 2³

=> A = n.2ⁿ⁺¹ - (2ⁿ⁺¹ - 2³) - 2³

A = n.2ⁿ⁺¹ - 2ⁿ⁺¹ + 2³ - 2³

A = (n-1).2ⁿ⁺¹

Mà 2.2²+ 3.2³ + 4.2⁴ + 5.2⁵ + · · · + n.2ⁿ = 2ⁿ⁺¹⁰

=> A = 2ⁿ⁺¹⁰

=> (n-1).2ⁿ⁺¹ = 2ⁿ⁺¹⁰

(n-1) = 2ⁿ⁺¹⁰ : 2ⁿ⁺¹

n-1 = 2⁹

n = 512 + 1

n = 513

Nowdays, children seem to lost thier ...engjoyment...in reading (ẹnjoy)

1. I admire Pedro because he is a very honest person, I think. (HIS)

- What I admire about Pedro is his honesty, I think.

2. She was disappointed not to win the competition. (CAME)

- Not winning the competition came as a disapointment to her.

4. I wasn’t allowed to play by the canal when I was a child. (LET)

- My parents didn't let me play near the canal when I was a child.

6. He is certainly not a reliable witness. (MEANS)

- He is by no means a reliable witness.

7. They could not warn people by electronic mail because that might spread the computer virus. (FEAR)

- They could not warn people by electronic mail for fear of spreading the computer virus.

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