The boy dived into the water and after ______ seemed to be a long time, he came up again.
| A．what | B．that | C．it | D．which |
I want you to grow up in a world with no limits on your dreams and no achievements _____ your reach.
| A．on | B．of | C．beyond | D．within |
I have no idea what _____ while I was asleep.
| A．has happened | B．could happen | C．had happened | D．happened |
— What did you do during your holidays?
— ______
| A．Nothing much. | B．Nothing serious. |
| C．Nothing more. | D．Nothing interesting. |
Could you give me the phone number of _____ David Cooper on _____ Fifth Avenue?
| A．a ; the | B．a ; 不填 | C．不填；the | D．the ; the |
Without the earth’s atmosphere to protect them, astronauts can be exposed to intense radiation from the sun, ____ them at risk of cancer.
| A．to leave | B．leaving | C．having left | D．left |