People in Nome all had diphtheria, a disease that spreads very fast. If ________, it would produce a powerful poison that would kill the patient.
| A．untreating | B．to untreat | C．untreated | D．untreat |
They their side of the field very well.
| A．defended | B．protected |
| C．keep | D．prevent |
Her father gave her the ___ of going on to college or starting to work.
| A．chance | B．opportunity |
| C．alternative | D．possibility |
He soon found himself his new co-workers.
| A．in harmony of | B．in the harmony of |
| C．in harmony with | D．in the harmony with |
is a good chance that I'I1 finish the work tomorrow.
| A．It | B．There | C．This | D．That |
Access the mountain-town is often difficult because of the bad roads.
| A．of | B．with | C．to | D．on |