Câu sai trong các câu sau là
A. Đường tròn có vô số trục đối xứng.
B. Đa giác đều n cạnh có đúng n trục đối xứng.
C. Hình thoi có hai trục đối xứng.
D. Một tam giác nào đó có thể có đúng hai trục đối xứng.

Choose the best answer for the following sentence:
Not all necessary things ___________ for our trip that's why the departure ____________.
 
A. will have been bought - has been postponed           
B. have been bought - has been postponed            
C. has been bought - had been postponed               
D. had been bought - has been postponed

Cho ngũ giác đều ABCDE tâm O. Ta xét các mệnh đề sau:1) Phép quay Q(O ; 72°) biến ABCDE thành chính nó.2) Phép quay Q(O ; 90°) biến ABCDE thành chính nó.3) Phép quay Q(O ; 144°) biến ABCDE thành chính nó.4) Phép quay Q(O ; 216°) biến ABCDE thành chính nó.Trong các mệnh đề trên:
A. Có duy nhất một mệnh đề đúng.
B. Có hai mệnh đề đúng.
C. Có ba mệnh đề đúng.
D. Tất cả bốn mệnh đề đều đúng.

Choose the best answer for the following sentence:
Consult your senior if you ____________ to write the application letter to the university. 
A. has wanted                 
B. will want
C. want              
D. are going to want

Choose the best answer for the following sentence:
With the strong commitment of our Government, we will gain greater _____________ .
A. improvements
B. achievements
C. renovations
D. developments

Choose the best answer for the following sentence:
This book is so long that I ___________________ . 
A. haven't finished it yet                
B. haven't finished it already 
C. still have finished it                  
D. still haven't finished it already

Choose the best answer for the following sentence:
______________ can be quite a good start for babies to get acquainted to reading. 
A. Reading in bed                     
B. Bed reading                    
C. Reading on bed
D. Reading bed

Choose the best answer for the following sentence:
''Where have you been?''
''I apologize ____________ being late but I missed the bus.''
A. to
B. by 
C. for
D. of

Choose the best answer for the following sentence:
________________ customers are softened up with free gifts before the sales talk. 
A. Possible                 
B. Feasible                 
C. Potential                     
D. Practical

Choose the best answer for the following sentence:
“You're a really fast swimmer.” “When I was younger, I ____________ a mile in forty minutes.” 
A. could swim             
B. should swim                
C. may swim             
D. must swim