As we all know, smoking ___________ people’s health.
| A．is harmful to | B．do harm fo | C．does harmful to | D．harm |
When he，he couldn’t, for a moment, recognize his surroundings.
| A．got to | B．turned to | C．came to | D．went to |
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 |