I have no patience with gossips. What I told Bill was a secret. He______________it to you.

A. mustn’t read

B. shouldn’t have repeated

C. mustn’t have repeated

D. shouldn’t read

Định nghĩa hàm số có giới hạn +   ∞ khi x   →   -   ∞

Tìm các giới hạn sau  lim x → 1 -   2 x   -   7 x   -   1

I love _________ films but I seldom find time to go to the cinema

A. seeing

B. see

C. saw

D. seen

Hỗn hợp X gồm hai este đều no, mạch hở có cùng số nhóm chức, trong phân tử mỗi este chỉ chứa một loại nhóm chức. Đun nóng 0,2 mol X với dung dịch NaOH vừa đủ, thu được hỗn hợp Y gồm các ancol và hỗn hợp Z gồm hai muối. Dẫn toàn bộ Y qua bình đựng Na dư, thấy khối lượng bình tăng 17,04 gam; đồng thời thoát ra 4,48 lít khí H₂ (đktc). Đốt cháy hoàn toàn Z cần dùng 0,52 mol O₂, thu được Na₂CO₃ và 0,78 mol hỗn hợp gồm CO₂ và H₂O. Phần trăm khối lượng của ancol có khối lượng phân tử lớn nhất trong hỗn hợp Y là

A. 42,7%.   

B. 21,3%.   

C. 52,3%.   

D. 26,1%.

Số đồng phân axit và este có công thức phân tử C 4 H 8 O 2  là:

A. 4.

B. 5.

C. 3.

D. 6.

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions.

The plan may be ingenious. It will never work in practice.

A. Ingenious as it may be, the plan will never work in practice

B. Ingenious as may the plan, it will never work in practice

C. The plan may be too ingenious to work in practice

D. The plan is as impractical as it is ingenious

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

          It is difficult to write rules that tell exactly when we should apologize, but it is not difficult to learn how. If we have done something to hurt someone’s feeling or if we have been impolite or rude, we should apologize. An apology indicates that we realize we have made a mistake, and we are sorry for it. It is a way of expressing our regret for something. When we apologize, we admit our wrongdoing, usually offer a reason for it, and express regret.

         The simplest way to apologize is to say “I’m sorry”, but often that is not enough. Let’s take a common situation. Mario is late for class and enters the classroom, interrupting the teacher in the middle of the class. What does he do? The most polite action is usually to take a seat as quietly as possible and apologize later. But if the teacher stops and waits for him to say something, he could apologize simply “I’m sorry I’m late”, ask permission to take his seat, and sit down. Naturally, more than this, a reason for the tardiness, is needed, but this is not the time or the place for it because he has already caused one interruption and doesn’t need to make it any longer or worse than it already is.

When we apologize, ________

A. we express our sadness and unluckiness.

B. we realize our wrongdoing.

C. we express our happiness.

D. we admit our wrongdoing, offer a reason for it, and express regret.