Each sentence has a mistake. Find it by choosing the letter A, B, C or D.

She is a studious child because she never forget to do homework

A. Stress and tiredness often cause to lack of concentration. 

B. Stress and tiredness often results in lack of concentration. 

C. Stress and tiredness often leads lack of concentration. 

D. Stress and tiredness often comes to lack of concentration. 

A. would    

B. enough kind    

C. to open    

D. please 

A. her     

B. interested    

C. in     

D. to join 

A. Their parents make these students to study so much. 

B. Their parents make these students study so much. 

C. Their parents made these students study so much. 

D. Their parents made these students to study so much. 

A. If it be fine tomorrow, we will go to the dentist. 

B. If it is fine tomorrow, we will go to the dentist. 

C. If it was fine tomorrow, we will go to the dentist. 

D. If it will be fine tomorrow, we go to the dentist. 

A. what

B. most effect

C. way     

D. marketing