24. The twins，_______ so long，held each other and burst into tears．
| A．being separated | B．having been separated | C．having separated | D．had been separated |
We attend lectures in the school lecture hall at weekend ____ seats more than 800 students.
| A．which | B．whose | C．where | D．when |
—How dangerous it was!
—Yes, but for the passer-by’s quick action, the girl ________.
| A．was drowned | B．could have been drowned |
| C．had drowned | D．should be drowned |
Due to the widespread________ of this medical technology, more diseases can be discovered and treated at an early stage.
| A．presentation | B．application |
| C．qualification | D．appreciation |
_____ her leg the last time, Brenda decided not to go on the school skiing trip this year.
| A．Breaking | B．Broken | C．To break | D．Having broken |
After a successful operation, my brother is beginning to ___ and will soon come back to school.
| A．pick up | B．wake up | C．grow up | D．show up |