．I ordered_________pizza and salad. The pizza was nice but_________salad was disgusting.
| A．the, the | B．a, the | C．a, a | D．the, a |
Make sure that the machine is kept where it is not ____ to children.
| A．possible | B．common | C．accessible | D．Useful |
Mary is the only one of the students in our class who ____ to the Great Wall so far.
| A．is | B．has been | C．are | D．had been |
Two years ago, the 9-year-old girl set up ___ organization named Angel to help ____ homeless.
| A．the; | B．; the | C．an; a | D．an; the |
For miles around me there was nothing but a desert, without a single plant or tree ______.
| A．on earth | B．in sight | C．at a distance | D．in place |
More and more people choose to shop in a supermarket as it offers a great ____ of goods.
| A．expression | B．mixture | C．variety | D．combination |