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.

Choose one sentence that has the closest meaning to the root one:
If I were taller, I could reach the top shelf.
A. I am not tall enough to reach the top shelf.
B. I am too tall to reach the top shelf.
C. I cannot reach the top shelf because I am very tall.
D. In spite of being tall, I cannot reach the top shelf.

Choose one sentence that has the same meaning as the root one:
If I had been watching the road, I wouldn’t have had an accident.
A. I have an accident because I am not watching the road.
B. I was watching the road, so I didn’t have an accident.
C. I am watching the road, so I don’t have an accident.
D. I had an accident because I wasn’t watching the road.

Choose one sentence that has the same meaning as the root one:
A very successful salesman, Mr. Smith often has more customers than he can handle.
A. Mr. Smith’s customers cannot handle him successfully.
B. Mr. Smith finds it difficult to handle his customers.
C. Mr. Smith is a successful salesman of handles to many customers.
D. Mr. Smith sometimes has too many customers to take care of.

Choose one sentence that has the same meaning as the root one:
They never made us do anything we didn’t want to do.
A. We are never made to do anything we didn't want to do.
B. We were never made to do anything we didn’t want to do.
C. We have never made to do anything we didn’t want to do.
D. We had never made to do anything we didn’t want to do.

Choose one sentence that has the same meaning as the root one:
We had planned to visit our grandmother, so we left early in the morning.
A. We left early to see our grandmother.
B. We left early because we are planning to visit our grandmother.
C. We left early because we were intending to visit our grandmother.
D. We were going to visit our grandmother so we try to leave early.

Choose one sentence that has the same meaning to the root one:
He stayed home because his father was ill.
A. If he hadn’t stayed home, his father wouldn’t have been ill.
B. If his father had been ill, he would have stayed home.
C. If his father wouldn’t have been ill, he had stayed home.
D. If his father hadn’t been ill, he wouldn’t have stayed home.

Cho hình chóp S.ABCD có đáy ABCD là một hình thoi có cạnh a và có SA=SB=SC=a. Góc giữa hai mặt phẳng (ABCD) và (SBD) bằng 90o. Dạng của ∆SBD là
A. Tam giác vuông
B. Tam giác cân
C. Tam giác vuông cân
D. Tam giác đều

Choose one sentence that has the same meaning to the root one:
"Please sit down", the teacher said to me.
A. The teacher asked me to please sit down.
B. The teacher asked me to sit down.
C. The teacher told me to please sit down.
D. The teacher told to sit down.