Hệ gồm hai vật 1 và 2 có khối lượng và tốc độ lần lượt là 1 kg; 3 m/s và 1,5 kg; 2 m/s. Biết hai vật chuyển động theo hướng ngược nhau. Tổng động lượng của hệ này là

A. 6 kg.m/s.

B. 0 kg.m/s.

C. 3 kg.m/s.

D. 4,5 kg.m/s.

Read the passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word or phrase that best fits each of the blanks

It can take a long time to become successful in your chosen field, however talented you are. One thing you have to be aware of is that you will face criticism along the way. The world is full of people who would rather say something negative than positive. If you’ve made up your (42) ______ to achieve a certain goal, such as writing a novel, don’t let the negative criticism of others prevent you from reaching your target, and let the constructive criticism have a positive effect on your work. If someone says you’re totally in the (43)_______ of talent, ignore them. That’s negative criticism. If, (44)________, someone advises you to revise your work and gives you a good reason for doing so, you should consider their suggestions carefully. There are many film stars who were once out of work . There are many famous novelists who made a complete mess of their first novel – or who didn’t, but had to keep on approaching hundreds of publishers before they could get it (45)_______. Being successful does depend on luck, to a certain extent. But things are more likely to (46)_______ well if you persevere and stay positive.
Question 43:

A. absentee

B. missing

C. lack

D. shortage

Anđehit có thể tham gia phản ứng tráng gương. Qua phản ứng này chứng tỏ anđehit có tính khử. Khi cho anđehit dư vào dung dịch brom, ta thấy

A. dung dịch brom mất màu do brom đã bị anđehit khử về bromua không màu.

B. dung dịch brom mất màu do brom đã cộng vào liên kết đôi C=O của anđehit.

C. dung dịch brom không mất màu do brom không bị anđehit khử.

D. dung dịch brom mất màu do brom đã bị anđehit oxi hóa lên ion bromat không màu.

-Lan: “Well, cats are very good at catching mice around the house.”

-Mai: “___________”

A. No, dogs are very good, too.

B. Yes, I hope so.

C. You can say that again.

D. Nothing more to say

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

Why don’t you ask the man where ______ to stay?

A. he would rather

B. he feels like

C. would he like

D. he would like

Mark the letter A, B, C or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.

A. meat

B. team

C. sea

D. clear