Is this research center _____you saw the modern equipment last year?
| A．which | B．that | C．the one where | D．the one that |
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 |
The headmaster didn’t make clear when and where the sports meeting would be held.
| A．this | B．that | C．it | D．one |