Jumping out of ____ airplane at ten thousand feet is quite ____ exciting experience.
| A．/; the | B．/; an | C．an; an | D．the; the |
The new research center will be set up was a wasteland 20 years ago.
| A．in what | B．where | C．in which | D．there |
These toys are not suitable for children four years old, who are too young.
| A．outside | B．beyond | C．under | D．within |
Cathy was a teacher from Newcastle, is almost as far north as you can g
| A．who | B．which | C．that | D．where |
Atlanta, as well as many other big cities, once again becoming one of the commercial and cultural centers of the USA right now.
| A．is | B．are | C．has been | D．have been |
in diving suits, they walked into a magic world lighted by lamps on board.
| A．Dressing | B．Wearing | C．Worn | D．Dressed |