He always () hard English .
A. studys
B. studies
C. study
D. studied
Please return the book to the library as soon as you () reading it.
A. finishes
B. will finish
C. finish
D. finished
I will go there when I () time tomorrow.
A. will have
B. have
C. had
D. had had
-How often do you go to the dentist?--- I () every six months.
A. is going
B. went
C. will go
D. go