Choose one sentence that has the same meaning as the root one:
I should have studied last night, but I was too tired.
A. I couldn’t study last night because I was very tired.
B. I studied last night because I was bored.
C. I studied last night because I had to.
D. I tried to study last night, but the homework was too hard.

Choose one sentence that has the same meaning as the root one:
He last had his eyes tested ten months ago.
A. He has not had his eyes tested for ten months.
B. He had tested his eyes ten months before.
C. He had not tested his eyes for ten months then.
D.  He didn’t have any tests on his eyes in ten months.

Cho tứ diện $ABCD$ có$AC=AD$ và$BC=BD$. Gọi$I$ là trung điểm của$CD$. Khẳng định nào sau đây sai?
A. Góc giữa hai mặt phẳng $\left( ABC \right)$ và$\left( ABD \right)$ là$\widehat{CBD}$.
B. Góc giữa hai mặt phẳng $\left( ACD \right)$ và$\left( BCD \right)$ là$\widehat{AIB}$.
C. $\left( BCD \right)\bot \left( AIB \right)$.
D. $\left( ACD \right)\bot \left( AIB \right)$.

Choose one sentence that has the same meaning as the root one:
The film was so boring that I fell asleep.
A. The film was interesting enough, but I fell asleep.
B. I fell asleep because the film was boring.
C. I did not fall asleep even though the film was boring.
D. The film was too long for me to watch.

Choose one sentence that has the same meaning as the root one:
Linda seems to have very little record for other people's feelings.
A. Linda has very few feelings like other people’s.
B. Linda appears unconcerned about other people’s feelings.
C. Linda has difficulty expressing her feelings for other people.
D. Linda doesn’t respect people who feel sorry for themselves.

Cho hàm số y = xcosx - sinx, ta có đạo hàm là:
A. 2cosx - xsinx.
B. xsinx.
C. -xsinx.
D. Cả ba phương án đã cho đều sai.

Choose one sentence that has the closest meaning to the root one:
Unless you come on time, we will go without you.
A. Come on time or we will go without you.
B. Come on time, we will go without you.
C. Because of your punctuality, we will go without you.
D. Without your coming on time, we will go.

Cho hình chóp S.ABCD có đáy ABCD là hình chữ nhật với $AB=a\sqrt{2},BC=a$ . Cạnh bên SA vuông góc với đáy và góc giữa cạnh bên SC với đáy là 600. Tính khoảng cách từ điểm C đến mặt phẳng (SBD).
A. $\frac{{a\sqrt{{38}}}}{{29}}$     
B.   $\frac{{3a\sqrt{{58}}}}{{29}}$
C.  $\frac{{3a\sqrt{{38}}}}{{29}}$  
D.   $\frac{{3a}}{{29}}$

Cho hình chóp $\displaystyle S.ABC$ có$\displaystyle SA=SB=SC$ và tam giác$\displaystyle ABC$ vuông tại$\displaystyle B$. Vẽ$\displaystyle SH\bot \left( ABC \right)$ ,$\displaystyle H\in \left( ABC \right).$ Khẳng định nào sau đây đúng?
A. $\displaystyle H$ trùng với trung điểm của$\displaystyle AC$.
B. $\displaystyle H$ trùng với trực tâm tam giác$\displaystyle ABC.$
C. $\displaystyle H$ trùng với trọng tâm tam giác$\displaystyle ABC$.   
D. $\displaystyle H$ trùng với trung điểm của$\displaystyle BC.$

Choose one sentence that has the same meaning as the root one:
He failed the test many times, but he didn’t stop trying.
A. Failing the test never discourages him.
B. He didn't stop trying although he failed the test many times.
C. He didn’t stop trying despite his first failure.
D. He never stops trying but fails to pass the test.