．The ____ boy was last seen ______ by the lake.
A missing, playing B．missing, play C． missed, played D．missed , to play
All of the flowers now raised here have developed from those _____ in the forest.
| A．once they grew | B．they grew once |
| C．that once grew | D．once grew |
On the table she found a piece of paper _________some puzzling secret codes.
| A．which was written | B．that was written |
| C．on which were written | D．on that were written |
The number 9.11 is a special number, ____, I think, that will be remembered by the Americans forever.
| A．what | B．it | C．which | D．one |
We are going to discuss the way of reading works ____ it is used for real life purposes, and this should give you a better understanding of it.
| A．that | B．which | C．where | D．when |
— I can’t find Mr Brown. Where did you meet him this morning?
—It was in the hotel _______ he stayed.
| A．that | B．which | C．where | D．when |