The wonderful time they had been looking forward ____ at last.
| A．to arrive | B．to arrived | C．to arriving | D．should arrive |
Some researchers believe that there is no doubt ______a cure for AIDS will be found.
| A．which | B．whether | C．that | D．what |
He was about to tell me the secret ______ someone patted him on the shoulder.
| A．as | B．while | C．when | D．until |
______ you’re tried it, you can’t imagine how pleasant it is.
| A．When | B．Although | C．Because | D．Unless |
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 |