_____ in the queue for half an hour, Tom suddenly realised that he had left his wallet at home．
| A．To wait | B．Have waited |
| C．To have waited | D．Having waited |
.They have their reasons for keeping their marriage___ secret for ___ moment.
| A．the; a | B．the; the | C．a; the | D．a; a |
Either the boy or his sister must have dinner here.
| A．his | B．her | C．their | D．theirs |
He had decided to give it up , but on____ second thoughts he decided to try___
third time.
| A．the; a | B．/ ; / | C．a; a | D．/ ; a |
stop fooling, boys and girls, and he .
| A．you | B．yours | C．yourself | D．yourselves |
.As is known to all,____ tiger is in____ danger of dying out.
| A．a; a | B．the; / | C．a; / | D．the; the |