When Chinese people talk about American cities, the first_____ comes into their minds is San Francisco.

I thought she was the very girl that I should marry _______ I met her.

That was the first time ______ I ______ face to face with the president.[ ]

The young woman ______ a FrenchmanShe has ______ him for five years

We should keep in mind that the earth is our only home and only by saving the environment________ourselves