It wasn’t an awful experience. It was the worst thing____________has ever happened to me.

A. which  

B. what   

C. that  

D. why

Choose the best answer to complete the blank in each of the following sentences.

If the lecturer last night____________Dr. Mason, I would have listened carefully.

A. would be 

B. was  

C. had been  

D. were

Chọn câu có khẳng định đúng: Chọn cặp phương trình tương đương.

A.   x   =   - 1   v à   x ( x   +   1 )   =   0

B. 5 x   -   2   =   3 x   +   4   v à   2 x   =   2

C. 5 ( 2 x   +   3 )   =   0   v à   3 ( 2 x   +   3 )   =   0

D.   x 2   -   4   =   0   v à   x   =   2