B. 88

a) 

5^x+1 = 125
5^x+1 = 5³
⇒ x + 1 = 3
    x = 3 - 1

    x = 2

Vậy x = 2

B. Fill in each blank with the appropriate form of an idiomatic expression from this unit only.

Jean: Hi, Pete. Did you come to take Sarah out?

Pete: Yes, Sarah wasn't able to come. She's at the dentist's office.

Jean: Oh? Why is that?

Pete: The dentist has to pick out one of her teeth. She has been complaining of pain all week long.

Jean: That's too bad. Well, I'm glad you're early.

Pete: Why? I didn't come early by myself.

Jean: I know, but now we have time to talk over that important matter about the new employee.

Pete: You mean the employee who's not get along with her co-workers?

Jean: Exactly. But please, take off your coat first and sit down on the couch.

Pete: Thanks.

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Vì bóng đèn đc mắc vào hiệu điện thế nhỏ hơn hiệu điện thế định mức của đèn nên bóng đèn sẽ tiêu thụ 1 công suất nhỏ hơn 75W.

Hiệu quả phép so sánh: Thể hiện sự mong ngóng đến gần như tuyệt vọng của đứa con khao khát tình mẹ đến cháy bỏng.

A. 

1. Hardly do people in britain speak a single word of my language.

2. The climbers were taken by surprises by the thunderstorm and they got wet.

3. Failure to obey the regulations may cause your disqualification.

4. The long and the short of it is that Joseph’s not up to the job.

B. 

1. It was hard to keep a straight face when she started to sing.

2. My husband has football on the brain, it's the only thing he ever thinks about.

3. My father’s going to go up the wall when he finds out that I’ve lost the car keys.

4. He was not able to cope with his job because of his health.

5. The new minister seems to have a flair for fielding awkward questions.

6. Some people say that the space rocket is credited to Siolkovsky.

CuO + H₂ → Cu + H₂O (1)

CuO + CO → Cu + H₂O (2)

n_{hh khí} = 0,05 (mol)

Theo PTHH (1) và (2) ta có:

n_Cu = n_{hh khí} = 0,05 (mol)

n_Cu = 64.0,05 = 3,2 (g)

Bài 4: Điền động từ khuyết thiếu “must” hoặc ‘mustn’t” vào chỗ trống để hoàn thành các câu sau.

I must do the laundry every2 days.

You must stay out too late.

You mustn't break the class’s rule.

My mother doesn’t want me to arrive home late, so I must leave now.

Those boys must finish their homework before going out.

Jim must finish his essay today because he’s very busy tomorrow.

Passengers mustn't use phones on the plane.

You mustn't be late for school tomorrow.

Children must be accompanied by an adult when visiting this dangerous place.

 I must be home before dinner.

 Students mustn't talk during the exam.

 You mustn't cheat in a test.

 There must be someone upstairs. I can hear the noise.

 We mustn't give up on what we are doing.

 You mustn't let strangers enter the house while I’m not in.