This new kind of chemicals will help keep the air, soil and water________ from pollution.
| A．free | B．empty | C．loose | D．short |
Much to our disappointment, things are not going so well as _______.
| A．planned | B．planning | C．plans | D．to plan |
I’ll never forget such a beautiful place _____ I spent my childhood there with my grandma.
| A．that | B．although | C．where | D．because |
—Do you know the tower ___ in the heart of the city?
—Do you mean the one ___ to the north of the city library?
| A．locating; lay | B．located; lying |
| C．being located; lying | D．located; lay |
—Do you know ____ the 2011 Xiamen International Marathon was held?
—On January 2．
| A．when it was that | B．when was it that |
| C．what it was that | D．what was it that |
Scientists across the world agree that this is an invention of ____ great significance, ____ invention that will greatly change human life.
| A．a; the | B．a; an | C．/ ; the | D．/ ; an |