Choose one sentence that has the same meaning as the root one:
Kate’s father was unhappy when she decided to quit school.
A. Kate’s father was very happy about her decision.
B. Kate was not happy about her father’s decision.
C. Kate's father was not happy about her quitting school.
D. Kate’s father decided not to send her to school.

Choose one sentence that has the same meaning as the root one:
Nancy isn’t used to walking so far.
A. Nancy used to walk farther.
B. Nancy doesn’t like to walk so far.
C. Nancy isn't accustomed to walking very far.
D. Nancy needed help to walk so far.

Choose one sentence that has the same meaning as the root one:
Whenever I hear this song, I remember the time when I was in Paris.
A. Whenever I hear this song, it makes me remember at the time when I was in Paris.
B. The song remembers me for the time when I was in Paris whenever I hear it.
C. The song reminds me at the time when I was in Paris whenever I hear it.
D. Whenever I hear this song, it reminds me of the time when I was in Paris.

Choose one sentence that has the same meaning as the root one:
Mark invited Sam to the cinema.
A.  “Do you like going to the cinema with me?” Mark asked Sam.
B. “Do you like me to invite you to go to the cinema?” Mark asked Sam.
C.  “Would you like to go to the cinema with me?” Mark asked Sam.
D.  “Would you like me inviting you to the cinema?” Mark asked Sam.

Choose one sentence that has the same meaning as the root one:
“Don’t forget to give me a ring at 10 o’clock tonight,” said Trung.
A. Trung said don’t forget to give him a ring at 10 o’clock tonight.
B. Trung told me not forget to give him a ring at 10 o’clock that night.
C. Trung remembered me to give him a ring at 10 o’clock tonight.
D. Trung reminded me to give him a ring at 10 o’clock that night.

Choose one sentence that has the same meaning as the root one:
In spite of their differences, Peter and John plan to be roommates.
A. Peter and John do not like each other.
B. Peter and John will be different roommates.
C. Peter and John are too different to be roommates.
D. Peter and John intend to be roommates even though they are different.

Cho cấp số nhân có u2=14; u5=16. Gọi công bội và số hạng đầu tiên lần lượt là q và u1 . Kết quả đúng là
A. q=12; u1=12.
B. q=-12; u1=-12.
C. q=4; u1=116.
D. q=-4; u1=-116.

Cho dãy số (un) với u1=1un+1=un+(-1)2n+1
Số hạng tổng quát un của dãy số là biểu thức 
A. un=2-n.
B. un không xác định.
C. un=1-n.
D. un=-n với mọi n.

Dãy số không là cấp số cộng là
A. 25, 21, 17, 13, 9, ...
B. un = 3n - 1.
C. un = 2n + 1.
D. un = (n + 1)2 - n2.

Cho dãy số  với , $n\ge 1$.
Số hạng tổng quátcủa dãy số là biểu thức:
A. un=1+n.
B. un=1-n.
C. un=1+(-1)2n.
D. un=n.