Tìm a, b để phương trình: x3+ax+b=0 có 3 nghiệm phân biệt lập thành cấp số cộng
A. b = 0, a < 0
B. b = 0, a = 1
C. b = 0, a > 0
D. b > 0, a < 0

Find a mistake in the four underlined parts of the sentence and correct it:
Mobile phones have had a significantly impact on telephone networks.
A. have had
B. significantly
C. on
D. networks

Cho dãy số (un) với un=k3n (k : hằng số).
Khẳng định sai là
A. Số hạng thứ 5 của dãy : k35.
B. Số hạng thứ n của dãy số: k3n+1.
C. Là dãy sô giảm khi k >0.
D. Là dãy số tăng khi k >0.

Cho dãy số 1, 12, 14, 18, 116,... Khẳng định sai là
A. Dãy số này là một cấp số nhân có u1=1q=12.
B. Số hạng tổng quát: un=12n-1.
C. Số hạng tổng quát: un=12n.
D. Là dãy số giảm.

Choose one sentence that has the same meaning as the root one:
The film was really interesting. They are talking about it.
A. The film was really interesting which they are talking about.
B. The film was really interesting about which they are talking.
C. The film which was really interesting they are talking about.
D. The film about which they are talking was really interesting.

Find a mistake in the four underlined parts of the sentence and correct it:
The quality of the shoes produced in this factory are very good.
A. shoes
B. produced
C. are
D. very good

Choose one sentence that has the same meaning as the root one:
Only the manager knows the details of the project.
A. Everyone, except the manager, knows the details of the project.
B. The details of the project are known by everybody, not only the manager.
C. It is the manager that knows the details of the project.
D. The details of the project are known by everybody, except the manager.

Choose a word that has different stress pattern:
environment              evaluation             eradicate                experience
A. environment              
B. evaluation             
C. eradicate                
D. experience

Choose the correct sentence which is built from the words and phrases given:
leave for Tet holiday / our class / hold a farewell party / 5pm next Friday
A. We want to leave for Tet holiday so our class will hold a farewell party at 5pm next Friday.
B.  Before leaving for Tet holiday, our class will hold a farewell party at 5pm next Friday.
C. In order to leave for Tet holiday, our class holds a farewell party at 5pm next Friday.
D. Whenever leaving for Tet holiday, our class will hold a farewell party at 5pm next Friday.

Choose one sentence that has the same meaning as the root one:
He’s getting them to mend the windows. 
A. He’s having the windows to mend. 
B. He’s having to mend the windows. 
C. He’s having to be mended the windows. 
D. He’s having the windows mended.