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 |
He is at least as tall as his brother, if not _________.
| A．tall | B．taller |
| C．so tall | D．the taller |
—Please don't make a noise ！
— _________.I will be as quiet as a mouse.
| A．Yes, I won't | B．No, I won't |
| C．No, I will | D．Yes, I will |
—I'll be away on a business trip. Would you mind looking after my cat?
—Not at all, _________.
| A．I've no time | B．I'd rather not |
| C．I'd like it | D．I'd be happy to |
The boy wanted to ride his bike in the street, but his mother told him _________.
| A．not to | B．not to do |
| C．not do it | D．don't |
Generally speaking, _________ according to the directions, the drug has no side effect.
| A．when taking | B．when taken |
| C．when to take | D．when to be taken |