Turn___________/left/ and you’ll see the post office.

He is _______ clever boy that he can solve _____ many difficult problems.

— What do you think of math? — I find               difficult to learn it.

— _______ can a tiger weigh, do you know? — Yes, I know that a big one can weigh over 300 kilos. 

--- Have you finished your work yet? ---No，I’ll finish it in _______ ten minutes.