51. After everyone took_______ place, the meeting began.
| A．his | B．their | C．there | D．the |
His uncle gave him books to read, but after a page or two he would put __book down and pick up__ new one.
| A．the,/ | B．a; a | C．a; the | D．the; a |
A non-smoker can hardly imagine__ pleasure of having__ smoke after a meat.
| A．1, a | B．a, a | C．the, a | D．1,1 |
.They have their reasons for keeping their marriage___ secret for ___ moment.
| A．the; a | B．the; the | C．a; the | D．a; a |
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 |
.As is known to all,____ tiger is in____ danger of dying out.
| A．a; a | B．the; / | C．a; / | D．the; the |