Before a problem can be solved, it must be obvious ________ the problem itself is.[ ]

The policeman _______ that the drunk driver get out of his car.

the first time you _______ Beijing—-No. But the first time I ______ here, the citywasn’t so beautiful.

Your story is perfect; I’ve never heard_____ before．

Did you watch A Bite of China II last night—Yes. I to enjoy the delicious food some day.