Hầu hết các máy điện hiện nay họat động theo nguyên tắc là
A.cả khung dây lẫn nam châm chuyển động tịnh tiến với nhau.
B.khung dây quay trong từ trường của nam châm hoặc nam châm quay trong lòng khung dây.
C.khung dây chuyển động tịnh tiến trước nam châm.
D.nam châm chuyển động tịnh tiến trước khung dây.

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
If my dad had not kept educating himself continuously, ______________.
A.he would not be a really successful man
B.he would not be a really successful man now
C.he would not have been a really successful man now
D.he will not be a really successful man now

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
If it _________ last night, it _______ so hot today.
A.was raining / were not
B.had rained / would not be
C.had rained / would not have been
D.rained / is not

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
If you ______ 5 minutes late, you ______ able to get into the examination room.
A.were/ would be
B.would be / weren’t
C.are / will not
D.will be/ will be

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
If Mary had put her efforts into learning English, _____________ .
 
A.she could have spoken with the foreign partners in this project now
B.she can speak with the foreign partners in this project now
C.she spoke with the foreign partners in this project now
D.she could speak with the foreign partners in this project now

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
_______ here, he would help us with these troubles.
 
A.If were Peter
B.Unless Peter were
C.Were Peter
D.Unless were Peter

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
_______ as much money as Bill Gates of Microsoft, I would retire.
A.Were I to have
B.If did I have
C.If I had had
D.Unless I had

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
Carrie said she ____ the company if the starting salary _______ her expectations.
 
A.will join/meets
B.would join/ would have met
C.would join/ have met
D.joins/ meet

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to the following question.
_______ if a war happened?
A.What will you do
B.What will you do
C.What you would do
D.What would you do

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