Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
______ he gets here soon, we will have to start the meeting without him.
A.Provided
B.Suppose
C.If
D.Unless

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
If my client _______ me her fax number, I _______ to post a letter to her.
 
A.gave,/ will not have
B.had given / will not have had
C.had given / wouldn't have had
D.will give / do not have

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Why didn’t you attend the meeting?- Oh, I did not know. If I_____, I_____ there.
A.had known / would have come
B.had known / will come
C.know / would come
D.known / had come

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Those engineers have failed. If they _______ learning, they _______ up with new developments and technology.
A.continued/would have kept
B.had continued, would have kept
C.continued/would have kept
D.had continued/ would keep

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
_______ more carefully, he would not have had the accident yesterday:
 
A.Had Peter driven
B.If Peter driven
C.If had Peter driven
D.Unless Peter had driven

Bộ phận quay của máy phát điện xoay chiều gọi là
A.nam châm.
B.cuộn dây.
C.rôto.
D.stato.

Máy phát điện xoay chiều là thiết bị điện dùng để
A.biến đổi nhiệt năng thành điện năng.
B.biến đổi quang năng thành điện năng.
C.biến đổi cơ năng thành điện năng.
D.biến đổi điện năng thành cơ năng.

Choose the word whose underlined part differs from the other three in pronunciation
A.racial
B.candle
C.clap
D.perhaps

Nếu $xy=4$ thì ${{\left( {{2}^{y}} \right)}^{x}}$ bằng
A.$16$
B.$8$
C.\(4\)
D.\(32\)

Cho $ x,y > 0,x\ne 1,y\ne 1 $ và $ m,n $ là các số thực tùy ý, tìm đẳng thức đúng trong các đẳng thức sau.
A. $ {{x}^{m}}.{{y}^{n}}={{\left( xy \right)}^{mn}} $ .
B. $ \sqrt[m]{{{x}^{n}}}={{x}^{\dfrac{m}{n}}} $ .
C. $ {{\left( {{x}^{m}} \right)}^{n}}={{\left( {{x}^{n}} \right)}^{m}} $ .
D. $ {{x}^{m}}+{{x}^{n}}={{x}^{m+n}} $ .