I appreciated ____ the opportunity to study abroad two years ago.
| A．having been given | B．having given | C．to have been given | D．to have given |
Before testing this method on patients, Dr. Baker had tests for two years
on three hundred dogs.
| A．found out | B．helped out | C．worked out | D．carried out |
If you like, ____ at any time.
| A．call on | B．drop in | C．visit | D．pay a visit to |
George’s mother had thought it would be good for his character to _______
from home and earn some money on his own.
| A．run away | B．take away | C．keep away | D．get away |
Ugly papers sold on streets are another problem of pollution.
Young readers should _____ them.
| A．throw away | B．keep away | C．break off | D．get rid of |
Both the man and his horse ________ after the long ride.
| A．gave out | B．worn out | C．tired out | D．run out |