Jumping out of ______ airplane at ten thousand feet is quite _____ exciting experience.
| A．/ ; the | B．/ ; an | C．an; an | D．the; the |
In many cities of China, if an ambulance is_______ in a traffic jam, police will respond to the emergency.
| A．held up | B．held back |
| C．held down | D．held out |
— I don’t remember having ever seen John since last week. Has he gone somewhere?
— Not really. He_______ his newly-bought apartment.
| A．has decorated | B．was decorating |
| C．decorated | D．has been decorating |
— Have you ever been to the Summer Palace?
— I can’t quite remember. _______, it might have been during my childhood.
| A．If any | B．If ever |
| C．If possible | D．If so |
— Your windows are still open? It’s so cold!
— Oh, sorry. They_______ .
| A．aren’t closing | B．won’t close |
| C．won’t be closed | D．aren’t closed |
We believe the time and hard work _______ in completing such an important project are worthwhile.
| A．involved | B．involving |
| C．to involve | D．to be involved |